Complete home mesh - power line extender compatibility

[Angieb1]

Have complete home mesh with 3 extra discs, all good. Now want to extend to outbuilding and wondering if a cheaper extender like bt power line might be compatible with the system or whether I need another disc @ c.£100 out there? Anyone tried mixing both? Or other lower cost  solutions? 

[Keith_Beddoe]

@Angieb1 

What colour are the discs, as its not clear which system you have?

If its the black BT Complete Wi-Fi system, then you can use Powerline adapters as well.  

[licquorice]

Doesn't really matter which discs are in use, the powerline adapters will be a separate network and can be used with either.