Maybe slightly off topic as well but i recently discovered these:
http://www.screwfix.com/p/power-ethernet-powerline-socket/41241
Pretty pricey but an incredibly neat solution. I'm surprised there aren't more people selling them.
pity they didnt incorporate USB port as well
£80 at amazon for those, less than screwfix
However might as well just get a regular powerline adapter and save yourself some cash.
This was what I was suggesting however, that gives you the same benefits + wifi for less money
http://www.amazon.co.uk/TP-Link-TL-WPA4220KIT-Powerline-Extender-Configuration/dp/B00DHB2T44/ref=sr_1_2?s=computers&ie=UTF8&qid=1403645951&sr=1-2&keywords=powerline+wifiThey also do a slower version for slightly less too!