One thing BT has going for it is its free openzones. Doesn't matter where I go in the UK I can always find one in most streets
It's 'free' for anybody else who joins Fon.
Buy a Fonera Router for a £25 once only fee and plug it into, say, your TalkTalk Router and you've got exactly the same Openzone access plus similar access in Europe and elsewhere.You can also set the Router so you only share as little as 512kb of your bandwidth