BT currently supports the below Powerline Adapters (for use with BT Hubs and EE TV Box). From time to time BT may introduce alternative Powerlines.
Your Powerline Adapters and BT Mini Connectors are set to work together as a pair and should work perfectly out of the box.
How to test adapters and connectors
Plug them in next to each other. You can use an extension strip (but not an anti-surge strip) to test, but use a wall socket in normal network setup.
Once plugged in, after 10 to 40 seconds the Powerline Adapters will configure themselves.
Check the lights on your adapters/connectors
BT Mini Connectors
BT Mini Connectors are working if both lights are solid blue.
Broadband Extender 600
The Broadband Extender 600s are working if all 3 lights are green.
The TP-Link (TL-PA7017) connectors are working if all 3 lights are green.