We found that Sky now do BB.
We were thinking of the Sky Max BB package, plus basic Sky tv.
The net is £10 pm plus the tv subscription (7.50 for the first few months, 15 quid after).
So at most £25 a month for Sky tv and Unlimited (fair use) BB at up to 16 meg dl speed.
If anyone wants to give it a look -
http://broadband.sky.com/flash.htm
Or has any experience with Sky as internet hosts? I gather it's a new thing for them to offer?