See my post seraphic.
Otherwise there are: Powerline networking options.
Placing your wireless router in the lounge (if you have Sky digital you should have a phone jack near your TV)
Getting an Xbox 1 network adapter which works.
http://www.amazon.co.uk/product-reviews/B0002AGJOE/ref=dp_top_cm_cr_acr_txt?ie=UTF8&showViewpoints=1
$17 pounds?
Tease.