I bought 2 of these when Play had them for £25 each and I am very impressed with them They work over extension leads and were a doddle to set up.
A steal at this price!
From the Dixons website:
Enhance and extend your home network Netgear XEB1004
Operates at up to 85mbps
85mbps Powerline Bundle
Turn any electrical socket into network
4 x 10/100 Ethernet port
Simple plug and play installation