I have 4 powerlink adapters 500 Mb/s (3 ethernet only (branded New Link, one of which is 3-port the other 2 are single port), 1 wifi only branded Devolo) available as surplus to requirements now.
If I still have the instructions I will dig them out, but they are sure to be available on-line.
Powerlink ethernet adapters (Deganwy) (Tywyn LL31)
This offer has been gifted to someone and is no longer available.