Tower hobbies, the wings are on there to. there may be somewhere uk based you can get them but i normally go there as you can get a lot of associated bits and bobs from there. Theyre normally in stock and it makes it worth the wait.
However last time i ordered from them it was here in 5 days.
http://www3.towerhobbies.com/cgi-bin...?&I=LX2697&P=7