Sky is crap even wish an ugly dish bolted to your wall so i wouldnt do that anyway. The are the most hideous things!! When the weather is bad its a bit like having someone screw an old useless rusty binlid to the side of your house. Seriously the Sky service is the most overhyped, over priced thing ever the only benefit is a few red buttons and Sky+ if you are into that kinda thing!
Incidently Top Up TV is now available on terrestrial
http://www.topup.tv and would enable you to get E4 and UK Gold at Primtime for £7.99 a month.