Spot on … I’ve got a Sky Router (as they make it awkward to use a different router). The wifi signal isn’t brilliant. Therefore I use two Homeplugs to extend the signal.
Homeplug is a name for the consortium of “network over power” adapter manufacturers, such as Netgear, Belkin, Devolo etc.
Mine connects via ethernet into the back of the router, into the homeplug which is connected to a mains socket.
The other one is at the other end of the house, and offers 3 ethernet sockets, and also pipes out Wifi-N signal. The wifi signal is a different network name, just for simplicity.
I would strongly advise changing the security password via the software console. They are supposed to stop their broadcast at the main switchbox … however I managed to pick up my neighbours homeplugs!!