<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2023 Workiva-->
<!--r:0429565b-6d09-4a96-bbea-eb7e3c721e62,g:ecc7fa53-76cf-4f67-95d8-5a826a413c82-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:arcroleRef arcroleURI="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/arcrole/esma-arcrole-2018-11-21.xsd#wider-narrower"/>
  <link:roleRef roleURI="http://bt.com/role/StatementofchangesinequityParenthesis" xlink:type="simple" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#StatementofchangesinequityParenthesis"/>
  <link:definitionLink xlink:role="http://bt.com/role/StatementofchangesinequityParenthesis" xlink:type="extended" id="ibadfa52c25bf4575ac8ef505238d3426_StatementofchangesinequityParenthesis">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_1ffefaaf-8234-4ea4-80df-6e29ea9c3c67" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfChangesInEquityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_21c5484c-4cfc-41e8-b759-a2e788801374" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_1ffefaaf-8234-4ea4-80df-6e29ea9c3c67" xlink:to="loc_ifrs-full_Equity_21c5484c-4cfc-41e8-b759-a2e788801374" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_13d4015f-4876-47e4-b50d-5da5c4148c58" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfChangesInEquityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_1ffefaaf-8234-4ea4-80df-6e29ea9c3c67" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_13d4015f-4876-47e4-b50d-5da5c4148c58" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="scenario"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_e2c18789-1af4-4682-ab81-de9e35dd492f" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_13d4015f-4876-47e4-b50d-5da5c4148c58" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_e2c18789-1af4-4682-ab81-de9e35dd492f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityMember_68cccb02-033a-4050-b4b7-ba88c3b6d3cf" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_e2c18789-1af4-4682-ab81-de9e35dd492f" xlink:to="loc_ifrs-full_EquityMember_68cccb02-033a-4050-b4b7-ba88c3b6d3cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember_a03c23d5-4353-45fb-af94-c7cd30f59c20" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_68cccb02-033a-4050-b4b7-ba88c3b6d3cf" xlink:to="loc_ifrs-full_IssuedCapitalMember_a03c23d5-4353-45fb-af94-c7cd30f59c20" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bt.com/role/StatementofcomprehensiveincomeprofitorlossbyfunctionofexpenseStatement" xlink:type="simple" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#StatementofcomprehensiveincomeprofitorlossbyfunctionofexpenseStatement"/>
  <link:definitionLink xlink:role="http://bt.com/role/StatementofcomprehensiveincomeprofitorlossbyfunctionofexpenseStatement" xlink:type="extended" id="if97688f44d79406fade672d8a2cd92e2_StatementofcomprehensiveincomeprofitorlossbyfunctionofexpenseStatement">
    <link:loc xlink:type="locator" xlink:label="loc_btplc_SpecificItemsLineItems_cf9f96a8-fef1-4c57-a608-41959570e523" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_SpecificItemsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_btplc_SpecificItemsLineItems_cf9f96a8-fef1-4c57-a608-41959570e523" xlink:to="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_263b268c-f53e-49e1-8281-08515707e702" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Revenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_Revenue_263b268c-f53e-49e1-8281-08515707e702" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingExpense_7aec11b6-fab1-43e0-ac08-fab2a722fb90" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OperatingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_OperatingExpense_7aec11b6-fab1-43e0-ac08-fab2a722fb90" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9_95cf2942-8bb4-46ce-9037-e1fbafc72bea" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_ImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9_95cf2942-8bb4-46ce-9037-e1fbafc72bea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities_03de45ea-62a2-4eb3-8f44-45fdb08166d8" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossFromOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_ProfitLossFromOperatingActivities_03de45ea-62a2-4eb3-8f44-45fdb08166d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceCosts_5a6b0f4d-1597-4950-a667-c88bc7db2fad" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_FinanceCosts_5a6b0f4d-1597-4950-a667-c88bc7db2fad" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncome_a80dbe9f-8dbe-4328-9f8a-55c78b8c269f" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_FinanceIncome_a80dbe9f-8dbe-4328-9f8a-55c78b8c269f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncomeCost_0deaf7cb-b5fe-4209-b440-07771e293cea" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_FinanceIncomeCost_0deaf7cb-b5fe-4209-b440-07771e293cea" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_38f9d32a-0032-48e2-a500-614519f90da2" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_38f9d32a-0032-48e2-a500-614519f90da2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_327045ad-051a-4288-9551-8fb87cf25932" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_327045ad-051a-4288-9551-8fb87cf25932" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_489845b6-d7f2-4dce-9a91-607cce38358a" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_489845b6-d7f2-4dce-9a91-607cce38358a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_7d4ec844-0d94-4d4d-83bb-94a52c944710" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossAbstract_02dca26c-d703-486a-9052-f0c0f3483e38" xlink:to="loc_ifrs-full_ProfitLoss_7d4ec844-0d94-4d4d-83bb-94a52c944710" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_SpecificItemsTable_e1299014-316a-4a5e-841d-1892ef11aeeb" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_SpecificItemsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_btplc_SpecificItemsLineItems_cf9f96a8-fef1-4c57-a608-41959570e523" xlink:to="loc_btplc_SpecificItemsTable_e1299014-316a-4a5e-841d-1892ef11aeeb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="scenario"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_GroupIncomeStatementAxis_7ff1e6cd-f786-4506-a0d7-be94947e561d" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_GroupIncomeStatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_btplc_SpecificItemsTable_e1299014-316a-4a5e-841d-1892ef11aeeb" xlink:to="loc_btplc_GroupIncomeStatementAxis_7ff1e6cd-f786-4506-a0d7-be94947e561d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_GroupIncomeStatementMember_07f7700b-a62f-4e13-ac2f-69b5ee9e6553" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_GroupIncomeStatementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_btplc_GroupIncomeStatementAxis_7ff1e6cd-f786-4506-a0d7-be94947e561d" xlink:to="loc_btplc_GroupIncomeStatementMember_07f7700b-a62f-4e13-ac2f-69b5ee9e6553" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_BeforeSpecificItemsMember_f68ff577-7982-4ec0-b4e8-349b3f385b25" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_BeforeSpecificItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_btplc_GroupIncomeStatementMember_07f7700b-a62f-4e13-ac2f-69b5ee9e6553" xlink:to="loc_btplc_BeforeSpecificItemsMember_f68ff577-7982-4ec0-b4e8-349b3f385b25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_SpecificItemsMember_f049638f-d549-4454-b799-65e36afb06df" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_SpecificItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_btplc_GroupIncomeStatementMember_07f7700b-a62f-4e13-ac2f-69b5ee9e6553" xlink:to="loc_btplc_SpecificItemsMember_f049638f-d549-4454-b799-65e36afb06df" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="https://www.esma.europa.eu/xbrl/role/cor/esef_role-999999" xlink:type="simple" xlink:href="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor.xsd#esef_role-999999"/>
  <link:definitionLink xlink:role="https://www.esma.europa.eu/xbrl/role/cor/esef_role-999999" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:href="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor.xsd#esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_26be8e95-4e36-4e7e-8000-f8ffaa69ed6bNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLoss_26be8e95-4e36-4e7e-8000-f8ffaa69ed6bNotDimensionallyQualified" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_f95c6137-35e4-462d-b82b-24f38553b41fNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_f95c6137-35e4-462d-b82b-24f38553b41fNotDimensionallyQualified" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome_dcf19c89-54bc-4d65-ab73-d8e46cd13a48NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome_dcf19c89-54bc-4d65-ab73-d8e46cd13a48NotDimensionallyQualified" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation_194ecbaf-f3db-4d12-9fa5-d4050e9bd331NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation_194ecbaf-f3db-4d12-9fa5-d4050e9bd331NotDimensionallyQualified" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome_43663ca3-8f05-4557-8c1f-b17409154e06NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome_43663ca3-8f05-4557-8c1f-b17409154e06NotDimensionallyQualified" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax_95ea0ecd-5804-4aec-8abf-1a648d8d0eb7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax_95ea0ecd-5804-4aec-8abf-1a648d8d0eb7NotDimensionallyQualified" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax_0b595e6b-f76e-4c2f-9577-ed238c54476aNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax_0b595e6b-f76e-4c2f-9577-ed238c54476aNotDimensionallyQualified" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_90f06f0c-9141-45d8-a304-a51dfc2a7c59NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_90f06f0c-9141-45d8-a304-a51dfc2a7c59NotDimensionallyQualified" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax_dd7e544d-e36d-409d-a9ef-90b814d528c7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax_dd7e544d-e36d-409d-a9ef-90b814d528c7NotDimensionallyQualified" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_2daaa3a3-f726-481a-b0b9-8f0300251c01NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_2daaa3a3-f726-481a-b0b9-8f0300251c01NotDimensionallyQualified" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome_e1caa556-d16d-4ac4-abc0-8052db66c708NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ComprehensiveIncome_e1caa556-d16d-4ac4-abc0-8052db66c708NotDimensionallyQualified" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwill_43b1839e-4b98-492a-82f3-3f0f81e1df19NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IntangibleAssetsAndGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwill_43b1839e-4b98-492a-82f3-3f0f81e1df19NotDimensionallyQualified" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment_86aafc13-a1f3-467d-b957-c18563deefe3NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PropertyPlantAndEquipment_86aafc13-a1f3-467d-b957-c18563deefe3NotDimensionallyQualified" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RightofuseAssets_9fae8dab-7cbf-4745-8407-371699f4a233NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_RightofuseAssets_9fae8dab-7cbf-4745-8407-371699f4a233NotDimensionallyQualified" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentDerivativeFinancialAssets_9e8ce724-3488-43a4-8439-272f50f09452NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentDerivativeFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentDerivativeFinancialAssets_9e8ce724-3488-43a4-8439-272f50f09452NotDimensionallyQualified" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_8c7d7289-d90b-45ff-837e-b2bc055c21f2NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_8c7d7289-d90b-45ff-837e-b2bc055c21f2NotDimensionallyQualified" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod_614c389f-a567-445c-89de-f965034fcd27NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod_614c389f-a567-445c-89de-f965034fcd27NotDimensionallyQualified" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentReceivables_dc667b2d-b5a9-420b-84cd-ed0b16f085d4NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentReceivables_dc667b2d-b5a9-420b-84cd-ed0b16f085d4NotDimensionallyQualified" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_NonCurrentPreferenceSharesInJointVentures_209b7a18-1de2-4244-915f-e89167b560a2NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_NonCurrentPreferenceSharesInJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_NonCurrentPreferenceSharesInJointVentures_209b7a18-1de2-4244-915f-e89167b560a2NotDimensionallyQualified" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentContractAssets_770ac436-cdde-4b87-9ab5-d7f432e11ef2NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentContractAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentContractAssets_770ac436-cdde-4b87-9ab5-d7f432e11ef2NotDimensionallyQualified" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentRecognisedAssetsDefinedBenefitPlan_ca227af9-b653-4351-af39-7448afc0292cNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentRecognisedAssetsDefinedBenefitPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentRecognisedAssetsDefinedBenefitPlan_ca227af9-b653-4351-af39-7448afc0292cNotDimensionallyQualified" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxAssets_8c4bdec2-17d4-49a0-9100-336402ad2846NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DeferredTaxAssets_8c4bdec2-17d4-49a0-9100-336402ad2846NotDimensionallyQualified" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets_eac0a92c-e642-40e7-af30-42bd823ac5afNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentAssets_eac0a92c-e642-40e7-af30-42bd823ac5afNotDimensionallyQualified" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentProgrammingAssets_1218ea7f-5020-4a34-9c5f-42d554359fbaNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentProgrammingAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentProgrammingAssets_1218ea7f-5020-4a34-9c5f-42d554359fbaNotDimensionallyQualified" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Inventories_399472b8-4dbf-4a6e-99db-c8f717b22640NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Inventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Inventories_399472b8-4dbf-4a6e-99db-c8f717b22640NotDimensionallyQualified" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivables_96c1f80f-9344-472a-a94d-2d6cae053b6eNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_TradeAndOtherCurrentReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_TradeAndOtherCurrentReceivables_96c1f80f-9344-472a-a94d-2d6cae053b6eNotDimensionallyQualified" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_CurrentPreferenceSharesInJointVentures_86498025-82aa-48f4-8a55-d1b21c613ba9NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_CurrentPreferenceSharesInJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_CurrentPreferenceSharesInJointVentures_86498025-82aa-48f4-8a55-d1b21c613ba9NotDimensionallyQualified" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentContractAssets_3156b3ce-7f8f-49f3-9a62-51e89c49d3e7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentContractAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentContractAssets_3156b3ce-7f8f-49f3-9a62-51e89c49d3e7NotDimensionallyQualified" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_7249d11c-5068-4d55-a5bb-fb5d2fb7bddcNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_7249d11c-5068-4d55-a5bb-fb5d2fb7bddcNotDimensionallyQualified" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxAssets_888f5ece-4cb0-44b7-83f9-fafd419c6d25NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentTaxAssets_888f5ece-4cb0-44b7-83f9-fafd419c6d25NotDimensionallyQualified" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentDerivativeFinancialAssets_13f6b7e3-097f-4bfe-91a7-3533034eb57eNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentDerivativeFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentDerivativeFinancialAssets_13f6b7e3-097f-4bfe-91a7-3533034eb57eNotDimensionallyQualified" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentInvestments_67eac6d4-6cc5-4c22-abad-df3453d90d09NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentInvestments_67eac6d4-6cc5-4c22-abad-df3453d90d09NotDimensionallyQualified" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents_532376bf-9a52-483e-b19f-e6bc0bd3c722NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashAndCashEquivalents_532376bf-9a52-483e-b19f-e6bc0bd3c722NotDimensionallyQualified" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets_d41480ee-0abb-4dd7-8b88-718d666d5496NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentAssets_d41480ee-0abb-4dd7-8b88-718d666d5496NotDimensionallyQualified" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShorttermBorrowings_697eeb5d-b22b-43d8-976e-0b0ececb1aeeNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShorttermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ShorttermBorrowings_697eeb5d-b22b-43d8-976e-0b0ececb1aeeNotDimensionallyQualified" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentDerivativeFinancialLiabilities_eb8b0006-ad37-4d78-a969-0ea39d512f17NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentDerivativeFinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentDerivativeFinancialLiabilities_eb8b0006-ad37-4d78-a969-0ea39d512f17NotDimensionallyQualified" xlink:type="arc" order="35"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayables_e87c4dca-2ed3-4e57-9020-1bc23f318fd5NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_TradeAndOtherCurrentPayables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_TradeAndOtherCurrentPayables_e87c4dca-2ed3-4e57-9020-1bc23f318fd5NotDimensionallyQualified" xlink:type="arc" order="36"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentContractLiabilities_6f46d828-7ca7-4d40-9542-c4478f9b02e1NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentContractLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentContractLiabilities_6f46d828-7ca7-4d40-9542-c4478f9b02e1NotDimensionallyQualified" xlink:type="arc" order="37"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLeaseLiabilities_0f79eafc-a641-4f5b-8c91-46e88b2c327fNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentLeaseLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentLeaseLiabilities_0f79eafc-a641-4f5b-8c91-46e88b2c327fNotDimensionallyQualified" xlink:type="arc" order="38"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale_874ad522-b60f-49a1-b401-22bcc768072eNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale_874ad522-b60f-49a1-b401-22bcc768072eNotDimensionallyQualified" xlink:type="arc" order="39"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxLiabilities_89cec006-d3e7-4d2f-8b5b-9153a8621b15NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentTaxLiabilities_89cec006-d3e7-4d2f-8b5b-9153a8621b15NotDimensionallyQualified" xlink:type="arc" order="40"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentProvisions_299ae150-000e-4c35-bab9-d97ec13724cfNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentProvisions_299ae150-000e-4c35-bab9-d97ec13724cfNotDimensionallyQualified" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities_b894a2b0-e043-4e77-8463-45e74a93a4e3NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentLiabilities_b894a2b0-e043-4e77-8463-45e74a93a4e3NotDimensionallyQualified" xlink:type="arc" order="42"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsLessCurrentLiabilities_b33d961a-8f35-419c-876b-dd2e7dc39aa3NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AssetsLessCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AssetsLessCurrentLiabilities_b33d961a-8f35-419c-876b-dd2e7dc39aa3NotDimensionallyQualified" xlink:type="arc" order="43"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowings_3003a92c-b570-4cf5-a02e-a608a6115e80NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LongtermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_LongtermBorrowings_3003a92c-b570-4cf5-a02e-a608a6115e80NotDimensionallyQualified" xlink:type="arc" order="44"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentDerivativeFinancialLiabilities_48e89f53-f090-4505-92a5-522b2c3212adNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentDerivativeFinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentDerivativeFinancialLiabilities_48e89f53-f090-4505-92a5-522b2c3212adNotDimensionallyQualified" xlink:type="arc" order="45"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentContractLiabilities_21830943-cca7-4d7d-a524-36bc508a4a1dNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentContractLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentContractLiabilities_21830943-cca7-4d7d-a524-36bc508a4a1dNotDimensionallyQualified" xlink:type="arc" order="46"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLeaseLiabilities_4a47c337-a93b-4232-8274-c44327717e31NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentLeaseLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentLeaseLiabilities_4a47c337-a93b-4232-8274-c44327717e31NotDimensionallyQualified" xlink:type="arc" order="47"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentRecognisedLiabilitiesDefinedBenefitPlan_1c6f004e-b2c1-48ad-8012-aca7580c51f1NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentRecognisedLiabilitiesDefinedBenefitPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentRecognisedLiabilitiesDefinedBenefitPlan_1c6f004e-b2c1-48ad-8012-aca7580c51f1NotDimensionallyQualified" xlink:type="arc" order="48"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherNoncurrentPayables_e59f77bf-4bd0-4813-a4b7-62836b48fccfNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherNoncurrentPayables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherNoncurrentPayables_e59f77bf-4bd0-4813-a4b7-62836b48fccfNotDimensionallyQualified" xlink:type="arc" order="49"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilities_e5fe2336-3696-4de3-805c-a3e3f8938ae5NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DeferredTaxLiabilities_e5fe2336-3696-4de3-805c-a3e3f8938ae5NotDimensionallyQualified" xlink:type="arc" order="50"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentProvisions_ecd27100-f194-428f-9b98-74d7fd1eef35NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentProvisions_ecd27100-f194-428f-9b98-74d7fd1eef35NotDimensionallyQualified" xlink:type="arc" order="51"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities_394a57df-d200-4088-97a1-41dab71f0196NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentLiabilities_394a57df-d200-4088-97a1-41dab71f0196NotDimensionallyQualified" xlink:type="arc" order="52"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_6fc70214-bcf8-4f91-a6aa-e80b41e8011cNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssuedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IssuedCapital_6fc70214-bcf8-4f91-a6aa-e80b41e8011cNotDimensionallyQualified" xlink:type="arc" order="53"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SharePremium_87b51d72-52dc-43ea-b17c-18ae2be81147NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_SharePremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_SharePremium_87b51d72-52dc-43ea-b17c-18ae2be81147NotDimensionallyQualified" xlink:type="arc" order="54"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherReserves_25402663-333b-4a23-8efd-62800316e3f7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherReserves"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherReserves_25402663-333b-4a23-8efd-62800316e3f7NotDimensionallyQualified" xlink:type="arc" order="55"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarnings_b65c21a0-8026-4ac9-8fd1-915cbff718c6NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RetainedEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_RetainedEarnings_b65c21a0-8026-4ac9-8fd1-915cbff718c6NotDimensionallyQualified" xlink:type="arc" order="56"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_2adbcc51-deef-4eec-a85b-0264f11e4bd5NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Equity_2adbcc51-deef-4eec-a85b-0264f11e4bd5NotDimensionallyQualified" xlink:type="arc" order="57"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_TotalEquityAndNonCurrentLiabilities_64d12d8d-bb03-45e7-811a-2435ce9c70efNotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_TotalEquityAndNonCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_TotalEquityAndNonCurrentLiabilities_64d12d8d-bb03-45e7-811a-2435ce9c70efNotDimensionallyQualified" xlink:type="arc" order="58"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTax_45eb43e4-c56b-464b-bda1-0ef8782ba1c5NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTax_45eb43e4-c56b-464b-bda1-0ef8782ba1c5NotDimensionallyQualified" xlink:type="arc" order="59"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome_ca5705a8-1b03-4d01-93ce-702e56a64fbdNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome_ca5705a8-1b03-4d01-93ce-702e56a64fbdNotDimensionallyQualified" xlink:type="arc" order="60"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_TransferredToTheIncomeStatement_9ad3808e-6797-470b-a304-58f726859860NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_TransferredToTheIncomeStatement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_TransferredToTheIncomeStatement_9ad3808e-6797-470b-a304-58f726859860NotDimensionallyQualified" xlink:type="arc" order="61"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaid_98dbc586-ed10-4d57-a0d8-de4d92ba0d8fNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DividendsPaid_98dbc586-ed10-4d57-a0d8-de4d92ba0d8fNotDimensionallyQualified" xlink:type="arc" order="62"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_457c2572-515d-480f-a908-6c93fc210568NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_457c2572-515d-480f-a908-6c93fc210568NotDimensionallyQualified" xlink:type="arc" order="63"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions_23876339-a4fc-4f9a-912b-fa9350f1cb6eNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions_23876339-a4fc-4f9a-912b-fa9350f1cb6eNotDimensionallyQualified" xlink:type="arc" order="64"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings_d31ddb91-e4b4-48fc-858f-a6239386cb3dNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings_d31ddb91-e4b4-48fc-858f-a6239386cb3dNotDimensionallyQualified" xlink:type="arc" order="65"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_782d7178-b861-493f-bc58-1ff640df5cbcNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_782d7178-b861-493f-bc58-1ff640df5cbcNotDimensionallyQualified" xlink:type="arc" order="66"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_df5a9f7b-d92a-46bf-bdb8-c55b916abab4NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_df5a9f7b-d92a-46bf-bdb8-c55b916abab4NotDimensionallyQualified" xlink:type="arc" order="67"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_48d9a23b-061b-46f7-8db0-33abe8876ad6NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_48d9a23b-061b-46f7-8db0-33abe8876ad6NotDimensionallyQualified" xlink:type="arc" order="68"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncomeCost_b9013b2b-711a-47c1-acf8-f934eb2ba45cNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_FinanceIncomeCost_b9013b2b-711a-47c1-acf8-f934eb2ba45cNotDimensionallyQualified" xlink:type="arc" order="69"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities_50e95595-bb08-430e-9f71-21d79543e19eNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossFromOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossFromOperatingActivities_50e95595-bb08-430e-9f71-21d79543e19eNotDimensionallyQualified" xlink:type="arc" order="70"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherAdjustmentsForNoncashItems_8261157a-e848-4429-9488-a047348ca874NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherAdjustmentsForNoncashItems"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherAdjustmentsForNoncashItems_8261157a-e848-4429-9488-a047348ca874NotDimensionallyQualified" xlink:type="arc" order="71"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates_d336f07e-b5b8-4c05-b773-99a9a30e07edNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates_d336f07e-b5b8-4c05-b773-99a9a30e07edNotDimensionallyQualified" xlink:type="arc" order="72"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_AdjustmentsForProfitOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets_fc55149a-04d8-4e3d-9bd0-1182093852f2NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_AdjustmentsForProfitOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_AdjustmentsForProfitOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets_fc55149a-04d8-4e3d-9bd0-1182093852f2NotDimensionallyQualified" xlink:type="arc" order="73"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense_7f409b9e-f6f8-46ea-a5cb-98332a3a08e5NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense_7f409b9e-f6f8-46ea-a5cb-98332a3a08e5NotDimensionallyQualified" xlink:type="arc" order="74"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_de4008c4-8223-4bb5-a9c5-4b79cf69a3c7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_de4008c4-8223-4bb5-a9c5-4b79cf69a3c7NotDimensionallyQualified" xlink:type="arc" order="75"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_AdjustmentsForDecreaseIncreaseInProgrammeRights_6560407c-1c77-488f-86b6-aa8248c5db78NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_AdjustmentsForDecreaseIncreaseInProgrammeRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_AdjustmentsForDecreaseIncreaseInProgrammeRights_6560407c-1c77-488f-86b6-aa8248c5db78NotDimensionallyQualified" xlink:type="arc" order="76"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_a38ce4d6-a956-452f-8ce5-bd12521a0934NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_a38ce4d6-a956-452f-8ce5-bd12521a0934NotDimensionallyQualified" xlink:type="arc" order="77"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_AdjustmentsForIncreaseDecreaseInContractAssets_99941dff-93b3-45f7-9e86-c4e7a8a599bdNotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_AdjustmentsForIncreaseDecreaseInContractAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_AdjustmentsForIncreaseDecreaseInContractAssets_99941dff-93b3-45f7-9e86-c4e7a8a599bdNotDimensionallyQualified" xlink:type="arc" order="78"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_a79dbcfe-73b3-434a-afdc-8e574b63fce9NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_a79dbcfe-73b3-434a-afdc-8e574b63fce9NotDimensionallyQualified" xlink:type="arc" order="79"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_AdjustmentsForDecreaseIncreaseInContractLiabilities_5bada0c3-8ed7-485f-9aa0-15c9f72f9df6NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_AdjustmentsForDecreaseIncreaseInContractLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_AdjustmentsForDecreaseIncreaseInContractLiabilities_5bada0c3-8ed7-485f-9aa0-15c9f72f9df6NotDimensionallyQualified" xlink:type="arc" order="80"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities_a61ea8bc-0f96-4690-9690-086b9e6acbc6NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities_a61ea8bc-0f96-4690-9690-086b9e6acbc6NotDimensionallyQualified" xlink:type="arc" order="81"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForProvisions_2fa1e084-d3e4-4a72-b94b-378bcd51bf3eNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForProvisions_2fa1e084-d3e4-4a72-b94b-378bcd51bf3eNotDimensionallyQualified" xlink:type="arc" order="82"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperations_c67e83ed-230d-4d5c-8482-a94b1f55604aNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromUsedInOperations_c67e83ed-230d-4d5c-8482-a94b1f55604aNotDimensionallyQualified" xlink:type="arc" order="83"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_2dee51eb-e9e3-425c-ab2d-45671bf7a061NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_2dee51eb-e9e3-425c-ab2d-45671bf7a061NotDimensionallyQualified" xlink:type="arc" order="84"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_1457eb54-ef11-4622-a07f-71d5959e662eNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_1457eb54-ef11-4622-a07f-71d5959e662eNotDimensionallyQualified" xlink:type="arc" order="85"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestReceivedClassifiedAsInvestingActivities_c7de9523-aae1-4e6f-a124-e4724f3541e3NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestReceivedClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InterestReceivedClassifiedAsInvestingActivities_c7de9523-aae1-4e6f-a124-e4724f3541e3NotDimensionallyQualified" xlink:type="arc" order="86"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities_203d039f-5abb-40c1-8f25-ff03742eb1cbNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities_203d039f-5abb-40c1-8f25-ff03742eb1cbNotDimensionallyQualified" xlink:type="arc" order="87"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_a448234e-2ff4-4c38-a6cd-e121085bcb40NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_a448234e-2ff4-4c38-a6cd-e121085bcb40NotDimensionallyQualified" xlink:type="arc" order="88"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OutflowsOfCashFromInvestingActivities_c348482f-82c2-424b-afa5-6d9065069da1NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OutflowsOfCashFromInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OutflowsOfCashFromInvestingActivities_c348482f-82c2-424b-afa5-6d9065069da1NotDimensionallyQualified" xlink:type="arc" order="89"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_ProceedsOnDisposalOfCurrentFinancialAssetsClassifiedAsInvestingActivities_c2ee0e34-1ce0-4e22-b8bf-f8ea780d4aebNotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_ProceedsOnDisposalOfCurrentFinancialAssetsClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_ProceedsOnDisposalOfCurrentFinancialAssetsClassifiedAsInvestingActivities_c2ee0e34-1ce0-4e22-b8bf-f8ea780d4aebNotDimensionallyQualified" xlink:type="arc" order="90"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_PurchasesOfCurrentFinancialAssetsClassifiedAsInvestingActivities_3a78885b-2268-4a76-855b-6254def9ac48NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_PurchasesOfCurrentFinancialAssetsClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_PurchasesOfCurrentFinancialAssetsClassifiedAsInvestingActivities_3a78885b-2268-4a76-855b-6254def9ac48NotDimensionallyQualified" xlink:type="arc" order="91"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_NetPurchaseDisposalOfNonCurrentAssetInvestmentsClassifiedAsInvestingActivities_e86b5dc0-b6e6-433f-bbdc-91fdd4044aedNotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_NetPurchaseDisposalOfNonCurrentAssetInvestmentsClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_NetPurchaseDisposalOfNonCurrentAssetInvestmentsClassifiedAsInvestingActivities_e86b5dc0-b6e6-433f-bbdc-91fdd4044aedNotDimensionallyQualified" xlink:type="arc" order="92"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets_f8a086d0-f98c-4acf-b088-ec04f6dcda83NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets_f8a086d0-f98c-4acf-b088-ec04f6dcda83NotDimensionallyQualified" xlink:type="arc" order="93"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets_82ca4bc7-8e2a-4291-8069-e7a2d5daa41cNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets_82ca4bc7-8e2a-4291-8069-e7a2d5daa41cNotDimensionallyQualified" xlink:type="arc" order="94"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_IncreaseDecreaseInAmountsOwedByJointVenturesClassifiedAsInvestingActivities_827f09d8-b917-43e2-955a-bb5afcc2f854NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_IncreaseDecreaseInAmountsOwedByJointVenturesClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_IncreaseDecreaseInAmountsOwedByJointVenturesClassifiedAsInvestingActivities_827f09d8-b917-43e2-955a-bb5afcc2f854NotDimensionallyQualified" xlink:type="arc" order="95"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_SettlementOfMinimumGuaranteeLiabilityWithSportsJointVentureClassifiedAsInvestingActivities_57de7ba7-1049-47d1-b8db-d63ffc9763d6NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_SettlementOfMinimumGuaranteeLiabilityWithSportsJointVentureClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_SettlementOfMinimumGuaranteeLiabilityWithSportsJointVentureClassifiedAsInvestingActivities_57de7ba7-1049-47d1-b8db-d63ffc9763d6NotDimensionallyQualified" xlink:type="arc" order="96"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_0f4b2c9d-e751-4be4-b0d6-c1b77f5ddd58NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_0f4b2c9d-e751-4be4-b0d6-c1b77f5ddd58NotDimensionallyQualified" xlink:type="arc" order="97"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsFinancingActivities_18ad56cc-07dd-477e-be38-5798a9e48eb0NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestPaidClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InterestPaidClassifiedAsFinancingActivities_18ad56cc-07dd-477e-be38-5798a9e48eb0NotDimensionallyQualified" xlink:type="arc" order="98"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_d9a764d3-9a79-47a3-a799-cc127fc25e7cNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_d9a764d3-9a79-47a3-a799-cc127fc25e7cNotDimensionallyQualified" xlink:type="arc" order="99"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_37abb057-89fd-4b09-b6a9-c927fa561c31NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_37abb057-89fd-4b09-b6a9-c927fa561c31NotDimensionallyQualified" xlink:type="arc" order="100"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_eb91d454-08ba-4743-bcda-689393d8e876NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_eb91d454-08ba-4743-bcda-689393d8e876NotDimensionallyQualified" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_CashFlowsFromDerivativesRelatedToNetDebtClassifiedAsFinancingActivities_1eac92dd-1c17-486f-a789-d37155d8cc26NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_CashFlowsFromDerivativesRelatedToNetDebtClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_CashFlowsFromDerivativesRelatedToNetDebtClassifiedAsFinancingActivities_1eac92dd-1c17-486f-a789-d37155d8cc26NotDimensionallyQualified" xlink:type="arc" order="102"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_ChangesInOwnershipInterestsInSubsidiariesClassifiedAsFinancingActivities_d7f46bb5-aabd-410b-a75f-c1343227c394NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_ChangesInOwnershipInterestsInSubsidiariesClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_ChangesInOwnershipInterestsInSubsidiariesClassifiedAsFinancingActivities_d7f46bb5-aabd-410b-a75f-c1343227c394NotDimensionallyQualified" xlink:type="arc" order="103"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_IncreaseDecreaseInAmountsOwedToJointVenturesClassifiedAsFinancingActivities_79072a33-d74d-4c38-8a76-c12ba65a3471NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_IncreaseDecreaseInAmountsOwedToJointVenturesClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_IncreaseDecreaseInAmountsOwedToJointVenturesClassifiedAsFinancingActivities_79072a33-d74d-4c38-8a76-c12ba65a3471NotDimensionallyQualified" xlink:type="arc" order="104"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_bb900157-3fc7-4888-aa44-8aad131cd9e0NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_bb900157-3fc7-4888-aa44-8aad131cd9e0NotDimensionallyQualified" xlink:type="arc" order="105"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_77abd64d-df6d-4900-8c46-051462acbecfNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_77abd64d-df6d-4900-8c46-051462acbecfNotDimensionallyQualified" xlink:type="arc" order="106"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_2c5fe21f-7040-48b9-8bd2-5bce5b163c01NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_2c5fe21f-7040-48b9-8bd2-5bce5b163c01NotDimensionallyQualified" xlink:type="arc" order="107"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_95d81f5e-6620-4212-bf2f-b0c815c63334NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_95d81f5e-6620-4212-bf2f-b0c815c63334NotDimensionallyQualified" xlink:type="arc" order="108"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_PensionDeficitPaymentIncludedInAdjustmentsForOtherLiabilities_2648152a-999e-4cad-8fb2-9853780a768aNotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_PensionDeficitPaymentIncludedInAdjustmentsForOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_PensionDeficitPaymentIncludedInAdjustmentsForOtherLiabilities_2648152a-999e-4cad-8fb2-9853780a768aNotDimensionallyQualified" xlink:type="arc" order="109"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_AdditionToPropertyPlantAndEquipmentAndSoftware_dc43de32-3154-4d18-a79f-8c6d58f51c1bNotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_AdditionToPropertyPlantAndEquipmentAndSoftware"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_AdditionToPropertyPlantAndEquipmentAndSoftware_dc43de32-3154-4d18-a79f-8c6d58f51c1bNotDimensionallyQualified" xlink:type="arc" order="110"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_MovementInCapitalAccruals_eb1e3f35-a24b-4792-bfe1-dbda41616626NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_MovementInCapitalAccruals"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_MovementInCapitalAccruals_eb1e3f35-a24b-4792-bfe1-dbda41616626NotDimensionallyQualified" xlink:type="arc" order="111"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_PrepaymentsInRespectOfSpectrum_0de7ea9b-c4c6-44b4-a625-06310b85def5NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_PrepaymentsInRespectOfSpectrum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_PrepaymentsInRespectOfSpectrum_0de7ea9b-c4c6-44b4-a625-06310b85def5NotDimensionallyQualified" xlink:type="arc" order="112"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_BankOverdraftsExcludedFromCashAndCashEquivalents_f81a5e28-1456-4695-b0c4-fd5568f72335NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_BankOverdraftsExcludedFromCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_BankOverdraftsExcludedFromCashAndCashEquivalents_f81a5e28-1456-4695-b0c4-fd5568f72335NotDimensionallyQualified" xlink:type="arc" order="113"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification_b685000a-ea3c-4ef8-b384-08b1d3e43e75NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification_b685000a-ea3c-4ef8-b384-08b1d3e43e75NotDimensionallyQualified" xlink:type="arc" order="114"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LegalFormOfEntity_e6e00f58-434f-4ad3-8b76-a550752e5a0bNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LegalFormOfEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_LegalFormOfEntity_e6e00f58-434f-4ad3-8b76-a550752e5a0bNotDimensionallyQualified" xlink:type="arc" order="115"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AddressOfRegisteredOfficeOfEntity_d44e92c2-d6e4-4c00-93f2-9dcce03dc031NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AddressOfRegisteredOfficeOfEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AddressOfRegisteredOfficeOfEntity_d44e92c2-d6e4-4c00-93f2-9dcce03dc031NotDimensionallyQualified" xlink:type="arc" order="116"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NameOfParentEntity_9614aa06-8abe-4506-92d4-febe27a921a0NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NameOfParentEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NameOfParentEntity_9614aa06-8abe-4506-92d4-febe27a921a0NotDimensionallyQualified" xlink:type="arc" order="117"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NameOfUltimateParentOfGroup_acdb8c11-8f08-4a36-9e51-bfe14d31f3ceNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NameOfUltimateParentOfGroup"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NameOfUltimateParentOfGroup_acdb8c11-8f08-4a36-9e51-bfe14d31f3ceNotDimensionallyQualified" xlink:type="arc" order="118"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_693938ab-55a5-4e10-962a-41cb4e036b25NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_693938ab-55a5-4e10-962a-41cb4e036b25NotDimensionallyQualified" xlink:type="arc" order="119"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DomicileOfEntity_df2763e3-cef2-4ed5-82c0-498aea3855dfNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DomicileOfEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DomicileOfEntity_df2763e3-cef2-4ed5-82c0-498aea3855dfNotDimensionallyQualified" xlink:type="arc" order="120"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_DisclosureOfSpecificItemsTextBlock_2f767f05-990b-428b-b458-6df3de3a522bNotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_DisclosureOfSpecificItemsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_DisclosureOfSpecificItemsTextBlock_2f767f05-990b-428b-b458-6df3de3a522bNotDimensionallyQualified" xlink:type="arc" order="121"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_DescriptionOfAccountingPolicyForSpecificItemsTextBlock_ef2bacb5-c71f-49dc-be9a-c44b0f267e65NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_DescriptionOfAccountingPolicyForSpecificItemsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_DescriptionOfAccountingPolicyForSpecificItemsTextBlock_ef2bacb5-c71f-49dc-be9a-c44b0f267e65NotDimensionallyQualified" xlink:type="arc" order="122"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_DescriptionOfAccountingPolicyForImpairmentOfGoodwillTextBlock_a933bc7d-3b72-4121-8a2d-940cb7d2430fNotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_DescriptionOfAccountingPolicyForImpairmentOfGoodwillTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_DescriptionOfAccountingPolicyForImpairmentOfGoodwillTextBlock_a933bc7d-3b72-4121-8a2d-940cb7d2430fNotDimensionallyQualified" xlink:type="arc" order="123"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_DisclosureOfProgrammeRightsTextBlock_66ae8a37-27c3-4696-9fd4-9688a4ed9fd4NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_DisclosureOfProgrammeRightsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_DisclosureOfProgrammeRightsTextBlock_66ae8a37-27c3-4696-9fd4-9688a4ed9fd4NotDimensionallyQualified" xlink:type="arc" order="124"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_DescriptionOfAccountingPolicyForProgrammeRightsTextBlock_87648805-b146-4ce7-971c-2f95eec5d5c0NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_DescriptionOfAccountingPolicyForProgrammeRightsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_DescriptionOfAccountingPolicyForProgrammeRightsTextBlock_87648805-b146-4ce7-971c-2f95eec5d5c0NotDimensionallyQualified" xlink:type="arc" order="125"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_DisclosureOfDirectorsEmolumentsAndPensionsTextBlock_c93d0d48-53a7-4343-8a45-2f6c806ce5b0NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_DisclosureOfDirectorsEmolumentsAndPensionsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_DisclosureOfDirectorsEmolumentsAndPensionsTextBlock_c93d0d48-53a7-4343-8a45-2f6c806ce5b0NotDimensionallyQualified" xlink:type="arc" order="126"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_DescriptionOfAccountingPolicyForContractAssetsAndLiabilitiesTextBlock_58c7e5ea-1558-40c8-aaed-80f9f4cf9995NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_DescriptionOfAccountingPolicyForContractAssetsAndLiabilitiesTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_DescriptionOfAccountingPolicyForContractAssetsAndLiabilitiesTextBlock_58c7e5ea-1558-40c8-aaed-80f9f4cf9995NotDimensionallyQualified" xlink:type="arc" order="127"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_DescriptionOfAccountingPolicyForDeferredContractCostsTextBlock_88537984-a59d-4a00-8a9f-b4a59adc511cNotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_DescriptionOfAccountingPolicyForDeferredContractCostsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_DescriptionOfAccountingPolicyForDeferredContractCostsTextBlock_88537984-a59d-4a00-8a9f-b4a59adc511cNotDimensionallyQualified" xlink:type="arc" order="128"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_DescriptionOfAccountingPolicyForDefinedBenefitPlansTextBlock_b0d56c81-af58-4ebb-9e23-c9b743222ab7NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_DescriptionOfAccountingPolicyForDefinedBenefitPlansTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_DescriptionOfAccountingPolicyForDefinedBenefitPlansTextBlock_b0d56c81-af58-4ebb-9e23-c9b743222ab7NotDimensionallyQualified" xlink:type="arc" order="129"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_DescriptionOfAccountingPolicyForDefinedContributionPlansTextBlock_f83dcb70-b3a9-41a4-a5ca-7334acb2ec46NotDimensionallyQualified" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_DescriptionOfAccountingPolicyForDefinedContributionPlansTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_btplc_DescriptionOfAccountingPolicyForDefinedContributionPlansTextBlock_f83dcb70-b3a9-41a4-a5ca-7334acb2ec46NotDimensionallyQualified" xlink:type="arc" order="130"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory_44301926-f369-4cb0-a347-d8e1255f966bNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory_44301926-f369-4cb0-a347-d8e1255f966bNotDimensionallyQualified" xlink:type="arc" order="131"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory_31227ecb-4d5e-46eb-9c44-c8c2398aae46NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory_31227ecb-4d5e-46eb-9c44-c8c2398aae46NotDimensionallyQualified" xlink:type="arc" order="132"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory_48882d4a-a415-4510-8118-b40457922379NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory_48882d4a-a415-4510-8118-b40457922379NotDimensionallyQualified" xlink:type="arc" order="133"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGoingConcernExplanatory_dadf00b4-aca9-4f51-bc63-edc716558754NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfGoingConcernExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfGoingConcernExplanatory_dadf00b4-aca9-4f51-bc63-edc716558754NotDimensionallyQualified" xlink:type="arc" order="134"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory_0552e140-d262-4508-8198-f24363805099NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory_0552e140-d262-4508-8198-f24363805099NotDimensionallyQualified" xlink:type="arc" order="135"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory_64f66ef6-e323-43ee-a634-7b1a0c183ed7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory_64f66ef6-e323-43ee-a634-7b1a0c183ed7NotDimensionallyQualified" xlink:type="arc" order="136"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations_22481b88-5de2-4925-acfc-3bc91593b663NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations_22481b88-5de2-4925-acfc-3bc91593b663NotDimensionallyQualified" xlink:type="arc" order="137"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory_2b314dfd-89b2-402c-a9c0-e15b8cec7606NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory_2b314dfd-89b2-402c-a9c0-e15b8cec7606NotDimensionallyQualified" xlink:type="arc" order="138"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory_7d257d8c-9f95-4ecd-ac4d-40ec234dd32eNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfBasisOfConsolidationExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory_7d257d8c-9f95-4ecd-ac4d-40ec234dd32eNotDimensionallyQualified" xlink:type="arc" order="139"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories_940b0bee-6030-48e6-9cef-f836eb7bd439NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories_940b0bee-6030-48e6-9cef-f836eb7bd439NotDimensionallyQualified" xlink:type="arc" order="140"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants_749b5a8c-3820-4e99-b4ef-48774e262fcbNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants_749b5a8c-3820-4e99-b4ef-48774e262fcbNotDimensionallyQualified" xlink:type="arc" order="141"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory_ff054f3c-817e-4806-8e07-32dad7318160NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory_ff054f3c-817e-4806-8e07-32dad7318160NotDimensionallyQualified" xlink:type="arc" order="142"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory_9c046891-1fac-43f0-a0de-3791e943cf01NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory_9c046891-1fac-43f0-a0de-3791e943cf01NotDimensionallyQualified" xlink:type="arc" order="143"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForTerminationBenefits_810bd70e-f10a-45a7-ab3b-29bccec6ae1fNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForTerminationBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForTerminationBenefits_810bd70e-f10a-45a7-ab3b-29bccec6ae1fNotDimensionallyQualified" xlink:type="arc" order="144"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_b877154d-c96e-4bac-9bdd-1c579d94584fNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_b877154d-c96e-4bac-9bdd-1c579d94584fNotDimensionallyQualified" xlink:type="arc" order="145"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_cc88866d-9776-48bc-8752-fed1f34e4de2NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_cc88866d-9776-48bc-8752-fed1f34e4de2NotDimensionallyQualified" xlink:type="arc" order="146"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRevenueExplanatory_a1d83aa6-bc14-4526-bb29-ff2726c229f2NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfRevenueExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfRevenueExplanatory_a1d83aa6-bc14-4526-bb29-ff2726c229f2NotDimensionallyQualified" xlink:type="arc" order="147"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_a8bd7122-1496-4f2b-9631-026b50349ffcNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_a8bd7122-1496-4f2b-9631-026b50349ffcNotDimensionallyQualified" xlink:type="arc" order="148"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory_132e56f7-f4d9-4681-8d53-066276f57a21NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory_132e56f7-f4d9-4681-8d53-066276f57a21NotDimensionallyQualified" xlink:type="arc" order="149"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_963fb710-8b5e-4eae-bedc-13e1fc9b1ed7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_963fb710-8b5e-4eae-bedc-13e1fc9b1ed7NotDimensionallyQualified" xlink:type="arc" order="150"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory_e11821b5-0493-4a94-a3a1-6b4809c146e5NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory_e11821b5-0493-4a94-a3a1-6b4809c146e5NotDimensionallyQualified" xlink:type="arc" order="151"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory_01f9a7f0-740c-4dcc-b2f6-0cca41f9f09cNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAuditorsRemunerationExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory_01f9a7f0-740c-4dcc-b2f6-0cca41f9f09cNotDimensionallyQualified" xlink:type="arc" order="152"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIncomeTaxExplanatory_e5c7033b-5654-4d96-875d-52de7eb30935NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIncomeTaxExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfIncomeTaxExplanatory_e5c7033b-5654-4d96-875d-52de7eb30935NotDimensionallyQualified" xlink:type="arc" order="153"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory_fb62ce8b-75f1-4bc2-8e2e-66810ee183b5NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory_fb62ce8b-75f1-4bc2-8e2e-66810ee183b5NotDimensionallyQualified" xlink:type="arc" order="154"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDeferredTaxesExplanatory_72f473ee-2ffd-4138-ab99-687b73d8d106NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDeferredTaxesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDeferredTaxesExplanatory_72f473ee-2ffd-4138-ab99-687b73d8d106NotDimensionallyQualified" xlink:type="arc" order="155"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDividendsExplanatory_cad08238-9d32-4c9e-aff2-21a50666951bNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDividendsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDividendsExplanatory_cad08238-9d32-4c9e-aff2-21a50666951bNotDimensionallyQualified" xlink:type="arc" order="156"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGoodwillExplanatory_a1c5a22e-55fd-4af4-b83c-eb6925de4242NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfGoodwillExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfGoodwillExplanatory_a1c5a22e-55fd-4af4-b83c-eb6925de4242NotDimensionallyQualified" xlink:type="arc" order="157"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory_24fdd0f3-dafc-41d2-8e49-b0881cbebfeeNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory_24fdd0f3-dafc-41d2-8e49-b0881cbebfeeNotDimensionallyQualified" xlink:type="arc" order="158"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory_4ea4848c-e8e9-4ff9-b77c-edb36df0a6c6NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory_4ea4848c-e8e9-4ff9-b77c-edb36df0a6c6NotDimensionallyQualified" xlink:type="arc" order="159"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfImpairmentOfAssetsExplanatory_207d8612-4494-4ff6-ae90-c6f39716aaa0NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfImpairmentOfAssetsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfImpairmentOfAssetsExplanatory_207d8612-4494-4ff6-ae90-c6f39716aaa0NotDimensionallyQualified" xlink:type="arc" order="160"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsExplanatory_b110d27b-09fc-428e-bcbd-f743da0f9df6NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIntangibleAssetsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsExplanatory_b110d27b-09fc-428e-bcbd-f743da0f9df6NotDimensionallyQualified" xlink:type="arc" order="161"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory_f83db325-4c09-4c93-8b40-c29c7d11a88dNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory_f83db325-4c09-4c93-8b40-c29c7d11a88dNotDimensionallyQualified" xlink:type="arc" order="162"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_19e0f652-1008-40ce-b517-00372f67666cNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_19e0f652-1008-40ce-b517-00372f67666cNotDimensionallyQualified" xlink:type="arc" order="163"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfLeasesExplanatory_8b105bff-b59d-40e8-8eb6-0f3bb909f9cfNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfLeasesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfLeasesExplanatory_8b105bff-b59d-40e8-8eb6-0f3bb909f9cfNotDimensionallyQualified" xlink:type="arc" order="164"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_f6d1d90b-28f2-41ba-9624-be30c55e64a7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_f6d1d90b-28f2-41ba-9624-be30c55e64a7NotDimensionallyQualified" xlink:type="arc" order="165"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_9ad05c5d-4b63-49a4-a079-5a0f7c858331NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_9ad05c5d-4b63-49a4-a079-5a0f7c858331NotDimensionallyQualified" xlink:type="arc" order="166"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory_bb1c0b15-039a-4995-be12-30d092c19b02NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory_bb1c0b15-039a-4995-be12-30d092c19b02NotDimensionallyQualified" xlink:type="arc" order="167"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersExplanatory_9ce29727-ddd9-45ef-b020-44679771c61dNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersExplanatory_9ce29727-ddd9-45ef-b020-44679771c61dNotDimensionallyQualified" xlink:type="arc" order="168"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_0256adae-8398-40d6-b0d0-baa7317fb03dNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_0256adae-8398-40d6-b0d0-baa7317fb03dNotDimensionallyQualified" xlink:type="arc" order="169"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory_dbbacc23-18c0-4b98-9687-9b59f8acdbe9NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory_dbbacc23-18c0-4b98-9687-9b59f8acdbe9NotDimensionallyQualified" xlink:type="arc" order="170"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfProvisionsExplanatory_42d298c0-839d-4b3b-8777-01bf54c0ee78NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfProvisionsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfProvisionsExplanatory_42d298c0-839d-4b3b-8777-01bf54c0ee78NotDimensionallyQualified" xlink:type="arc" order="171"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesExplanatory_8fc654be-402b-4a16-8ec9-d0d50391d856NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfContingentLiabilitiesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfContingentLiabilitiesExplanatory_8fc654be-402b-4a16-8ec9-d0d50391d856NotDimensionallyQualified" xlink:type="arc" order="172"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory_04dd675a-e31a-4177-bc40-6a965175ea01NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory_04dd675a-e31a-4177-bc40-6a965175ea01NotDimensionallyQualified" xlink:type="arc" order="173"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForContingentLiabilitiesAndContingentAssetsExplanatory_3291b869-6b01-4596-8e3b-2b724966659cNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForContingentLiabilitiesAndContingentAssetsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForContingentLiabilitiesAndContingentAssetsExplanatory_3291b869-6b01-4596-8e3b-2b724966659cNotDimensionallyQualified" xlink:type="arc" order="174"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory_ed8847e0-c371-4de4-a009-0c0036de0a7eNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory_ed8847e0-c371-4de4-a009-0c0036de0a7eNotDimensionallyQualified" xlink:type="arc" order="175"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_0e39a850-59b2-49b6-ac90-e1b70d200c1fNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_0e39a850-59b2-49b6-ac90-e1b70d200c1fNotDimensionallyQualified" xlink:type="arc" order="176"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory_7ffc2319-2a30-458b-93fb-d49b36053c4fNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory_7ffc2319-2a30-458b-93fb-d49b36053c4fNotDimensionallyQualified" xlink:type="arc" order="177"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory_9aeb6a73-5d19-4fcc-9b43-1fc9f60d7f03NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory_9aeb6a73-5d19-4fcc-9b43-1fc9f60d7f03NotDimensionallyQualified" xlink:type="arc" order="178"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory_98d7d7e6-316f-43ce-97e1-75750c80d6e9NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory_98d7d7e6-316f-43ce-97e1-75750c80d6e9NotDimensionallyQualified" xlink:type="arc" order="179"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory_abcb2463-07bc-4937-b8c6-2c450d20d6c4NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory_abcb2463-07bc-4937-b8c6-2c450d20d6c4NotDimensionallyQualified" xlink:type="arc" order="180"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory_54667219-28d3-47d1-beb4-7bf124af880bNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory_54667219-28d3-47d1-beb4-7bf124af880bNotDimensionallyQualified" xlink:type="arc" order="181"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesExplanatory_18972566-9c0e-475f-b84f-d575e38f8b16NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfJointVenturesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfJointVenturesExplanatory_18972566-9c0e-475f-b84f-d575e38f8b16NotDimensionallyQualified" xlink:type="arc" order="182"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory_abbc0dab-daed-4988-9bc6-485b718dbe45NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory_abbc0dab-daed-4988-9bc6-485b718dbe45NotDimensionallyQualified" xlink:type="arc" order="183"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents_72338e8f-dfc5-4a9a-b23d-40e58bae5416NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents_72338e8f-dfc5-4a9a-b23d-40e58bae5416NotDimensionallyQualified" xlink:type="arc" order="184"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBorrowingsExplanatory_6b0f2c91-7cbc-4cb5-84c1-bbda74c29772NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfBorrowingsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfBorrowingsExplanatory_6b0f2c91-7cbc-4cb5-84c1-bbda74c29772NotDimensionallyQualified" xlink:type="arc" order="185"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory_8a53e510-fdef-4800-b557-150d549cd7b7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory_8a53e510-fdef-4800-b557-150d549cd7b7NotDimensionallyQualified" xlink:type="arc" order="186"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinanceCostExplanatory_0f4ba456-1098-4a6f-b872-adaa37947d37NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinanceCostExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFinanceCostExplanatory_0f4ba456-1098-4a6f-b872-adaa37947d37NotDimensionallyQualified" xlink:type="arc" order="187"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_6e1297be-b60a-455f-ab07-b2fa6f2407abNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinancialRiskManagementExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_6e1297be-b60a-455f-ab07-b2fa6f2407abNotDimensionallyQualified" xlink:type="arc" order="188"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory_e3714bfc-3c7c-4a4a-9765-8317f4d23989NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinancialInstrumentsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory_e3714bfc-3c7c-4a4a-9765-8317f4d23989NotDimensionallyQualified" xlink:type="arc" order="189"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfLiquidityRiskExplanatory_068c43be-1ae7-493e-a215-59aaab3cc2a7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfLiquidityRiskExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfLiquidityRiskExplanatory_068c43be-1ae7-493e-a215-59aaab3cc2a7NotDimensionallyQualified" xlink:type="arc" order="190"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfCreditRiskExplanatory_33e182f3-0109-41a7-8632-3298c6564efbNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCreditRiskExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCreditRiskExplanatory_33e182f3-0109-41a7-8632-3298c6564efbNotDimensionallyQualified" xlink:type="arc" order="191"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsAndHedgingExplanatory_afbb13bf-5020-4718-b087-b3503d0837f1NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsAndHedgingExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsAndHedgingExplanatory_afbb13bf-5020-4718-b087-b3503d0837f1NotDimensionallyQualified" xlink:type="arc" order="192"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDerivativeFinancialInstrumentsExplanatory_533fb6e8-1174-4654-a0bd-26a86989f874NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDerivativeFinancialInstrumentsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDerivativeFinancialInstrumentsExplanatory_533fb6e8-1174-4654-a0bd-26a86989f874NotDimensionallyQualified" xlink:type="arc" order="193"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory_3392797e-9b79-425f-8557-d573060402f7NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory_3392797e-9b79-425f-8557-d573060402f7NotDimensionallyQualified" xlink:type="arc" order="194"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory_239ab445-634e-48b1-880b-f4b266a24afdNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfRelatedPartyExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory_239ab445-634e-48b1-880b-f4b266a24afdNotDimensionallyQualified" xlink:type="arc" order="195"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfCommitmentsExplanatory_781d1ed0-69a0-44bf-9d48-d975a271c9fdNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCommitmentsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCommitmentsExplanatory_781d1ed0-69a0-44bf-9d48-d975a271c9fdNotDimensionallyQualified" xlink:type="arc" order="196"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_c8c8795f-dafa-4e8f-9bbc-e4bc164e2302NotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_c8c8795f-dafa-4e8f-9bbc-e4bc164e2302NotDimensionallyQualified" xlink:type="arc" order="197"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDefinedBenefitPlansExplanatory_a8892d67-57e1-484c-8c73-8018115c915eNotDimensionallyQualified" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDefinedBenefitPlansExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDefinedBenefitPlansExplanatory_a8892d67-57e1-484c-8c73-8018115c915eNotDimensionallyQualified" xlink:type="arc" order="198"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bt.com/role/Anchoring" xlink:type="simple" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#Anchoring"/>
  <link:definitionLink xlink:role="http://bt.com/role/Anchoring" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_btplc_AdditionToPropertyPlantAndEquipmentAndSoftware_374e8934-da4e-40c9-882c-38f551624da6" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_AdditionToPropertyPlantAndEquipmentAndSoftware"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets" xlink:to="loc_btplc_AdditionToPropertyPlantAndEquipmentAndSoftware_374e8934-da4e-40c9-882c-38f551624da6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_AdjustmentsForDecreaseIncreaseInContractLiabilities_31384f56-a4a2-4196-b990-f52e5eb530ae" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_AdjustmentsForDecreaseIncreaseInContractLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:to="loc_btplc_AdjustmentsForDecreaseIncreaseInContractLiabilities_31384f56-a4a2-4196-b990-f52e5eb530ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_AdjustmentsForDecreaseIncreaseInProgrammeRights_0fca1561-59ca-447e-baba-017334c4d00e" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_AdjustmentsForDecreaseIncreaseInProgrammeRights"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:to="loc_btplc_AdjustmentsForDecreaseIncreaseInProgrammeRights_0fca1561-59ca-447e-baba-017334c4d00e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_AdjustmentsForIncreaseDecreaseInContractAssets_ffe5170a-4908-4eb0-9131-2b9512c9443b" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_AdjustmentsForIncreaseDecreaseInContractAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:to="loc_btplc_AdjustmentsForIncreaseDecreaseInContractAssets_ffe5170a-4908-4eb0-9131-2b9512c9443b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_AdjustmentsForProfitOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets_b86731c2-f495-4381-8b95-3c45ec20da28" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_AdjustmentsForProfitOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:to="loc_btplc_AdjustmentsForProfitOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets_b86731c2-f495-4381-8b95-3c45ec20da28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_BankOverdraftsExcludedFromCashAndCashEquivalents_260eb7f2-08b2-4d4c-9f54-d32526291cc8" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_BankOverdraftsExcludedFromCashAndCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:to="loc_btplc_BankOverdraftsExcludedFromCashAndCashEquivalents_260eb7f2-08b2-4d4c-9f54-d32526291cc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_CashFlowsFromDerivativesRelatedToNetDebtClassifiedAsFinancingActivities_cb4d8167-502b-4adc-8825-6133cb03b29d" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_CashFlowsFromDerivativesRelatedToNetDebtClassifiedAsFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="loc_btplc_CashFlowsFromDerivativesRelatedToNetDebtClassifiedAsFinancingActivities_cb4d8167-502b-4adc-8825-6133cb03b29d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_ChangesInOwnershipInterestsInSubsidiariesClassifiedAsFinancingActivities_cb8a038d-dded-451a-b8d3-586c4ec87abc" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_ChangesInOwnershipInterestsInSubsidiariesClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="loc_btplc_ChangesInOwnershipInterestsInSubsidiariesClassifiedAsFinancingActivities_cb8a038d-dded-451a-b8d3-586c4ec87abc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_CurrentPreferenceSharesInJointVentures_1676fba1-cae8-4b41-9f7a-50ecb6d529b4" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_CurrentPreferenceSharesInJointVentures"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_CurrentAssets" xlink:to="loc_btplc_CurrentPreferenceSharesInJointVentures_1676fba1-cae8-4b41-9f7a-50ecb6d529b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_IncreaseDecreaseInAmountsOwedByJointVenturesClassifiedAsInvestingActivities_e4af275d-9f77-4753-87fa-6bf63dd038af" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_IncreaseDecreaseInAmountsOwedByJointVenturesClassifiedAsInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OutflowsOfCashFromInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:to="loc_btplc_IncreaseDecreaseInAmountsOwedByJointVenturesClassifiedAsInvestingActivities_e4af275d-9f77-4753-87fa-6bf63dd038af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_IncreaseDecreaseInAmountsOwedToJointVenturesClassifiedAsFinancingActivities_7f9859d2-c9c0-458f-a39a-7b14b317b464" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_IncreaseDecreaseInAmountsOwedToJointVenturesClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="loc_btplc_IncreaseDecreaseInAmountsOwedToJointVenturesClassifiedAsFinancingActivities_7f9859d2-c9c0-458f-a39a-7b14b317b464" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_MovementInCapitalAccruals_182d750a-db2b-4974-9754-8bd9d2d98345" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_MovementInCapitalAccruals"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets" xlink:to="loc_btplc_MovementInCapitalAccruals_182d750a-db2b-4974-9754-8bd9d2d98345" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_NetPurchaseDisposalOfNonCurrentAssetInvestmentsClassifiedAsInvestingActivities_d9308d47-0c1a-4ae3-a25a-e2370270bb6d" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_NetPurchaseDisposalOfNonCurrentAssetInvestmentsClassifiedAsInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:to="loc_btplc_NetPurchaseDisposalOfNonCurrentAssetInvestmentsClassifiedAsInvestingActivities_d9308d47-0c1a-4ae3-a25a-e2370270bb6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_btplc_NetPurchaseDisposalOfNonCurrentAssetInvestmentsClassifiedAsInvestingActivities_d9308d47-0c1a-4ae3-a25a-e2370270bb6d" xlink:to="loc_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_NonCurrentPreferenceSharesInJointVentures_2a4f6233-6418-4dd9-a39f-a22961b2a638" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_NonCurrentPreferenceSharesInJointVentures"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_NoncurrentAssets" xlink:to="loc_btplc_NonCurrentPreferenceSharesInJointVentures_2a4f6233-6418-4dd9-a39f-a22961b2a638" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_PensionDeficitPaymentIncludedInAdjustmentsForOtherLiabilities_5f0d8569-7790-463d-8f73-a05077af6f2c" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_PensionDeficitPaymentIncludedInAdjustmentsForOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:to="loc_btplc_PensionDeficitPaymentIncludedInAdjustmentsForOtherLiabilities_5f0d8569-7790-463d-8f73-a05077af6f2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_PrepaymentsInRespectOfSpectrum_5ceb5549-5fa0-430e-9333-467d6ea617ed" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_PrepaymentsInRespectOfSpectrum"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets" xlink:to="loc_btplc_PrepaymentsInRespectOfSpectrum_5ceb5549-5fa0-430e-9333-467d6ea617ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_ProceedsOnDisposalOfCurrentFinancialAssetsClassifiedAsInvestingActivities_2c98a341-fff8-4070-a76b-76a63b7bd98a" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_ProceedsOnDisposalOfCurrentFinancialAssetsClassifiedAsInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:to="loc_btplc_ProceedsOnDisposalOfCurrentFinancialAssetsClassifiedAsInvestingActivities_2c98a341-fff8-4070-a76b-76a63b7bd98a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_PurchasesOfCurrentFinancialAssetsClassifiedAsInvestingActivities_80f6be2d-26ba-47be-9c7e-336cbd7ae145" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_PurchasesOfCurrentFinancialAssetsClassifiedAsInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:to="loc_btplc_PurchasesOfCurrentFinancialAssetsClassifiedAsInvestingActivities_80f6be2d-26ba-47be-9c7e-336cbd7ae145" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_SettlementOfMinimumGuaranteeLiabilityWithSportsJointVentureClassifiedAsInvestingActivities_974bb455-50ab-4d86-8de0-6a5ec7e17acf" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_SettlementOfMinimumGuaranteeLiabilityWithSportsJointVentureClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OutflowsOfCashFromInvestingActivities" xlink:to="loc_btplc_SettlementOfMinimumGuaranteeLiabilityWithSportsJointVentureClassifiedAsInvestingActivities_974bb455-50ab-4d86-8de0-6a5ec7e17acf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_TotalEquityAndNonCurrentLiabilities_97324831-0360-416f-a292-994d7abca89c" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_TotalEquityAndNonCurrentLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAndLiabilities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_EquityAndLiabilities" xlink:to="loc_btplc_TotalEquityAndNonCurrentLiabilities_97324831-0360-416f-a292-994d7abca89c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_TransferredToTheIncomeStatement_cc0bb228-5f53-4ba5-8b74-5b08792a59f7" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_TransferredToTheIncomeStatement"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_ComprehensiveIncome" xlink:to="loc_btplc_TransferredToTheIncomeStatement_cc0bb228-5f53-4ba5-8b74-5b08792a59f7" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="https://www.esma.europa.eu/xbrl/role/cor/ifrs-dim_role-990000" xlink:type="simple" xlink:href="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor.xsd#ifrs-dim_role-990000"/>
  <link:definitionLink xlink:role="https://www.esma.europa.eu/xbrl/role/cor/ifrs-dim_role-990000" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_btplc_GroupIncomeStatementAxis_7ff1e6cd-f786-4506-a0d7-be94947e561d" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_GroupIncomeStatementAxis"/>
    <link:loc xlink:type="locator" xlink:label="loc_btplc_GroupIncomeStatementMember_7ff1e6cd-f786-4506-a0d7-be94947e561d_default" xlink:href="549300OWFMSO9NYV4H90-2023-03-31.xsd#btplc_GroupIncomeStatementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_btplc_GroupIncomeStatementAxis_7ff1e6cd-f786-4506-a0d7-be94947e561d" xlink:to="loc_btplc_GroupIncomeStatementMember_7ff1e6cd-f786-4506-a0d7-be94947e561d_default" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
