Hey David,
I use telewest for my internet, best there is by the way. If you haven't had it installed yet then they can set it up wireless for you although it would probably be cheaper to go to PC World or somewhere like that and buy a wireless router then just connect that directly to the modem once it is in and follow the instructions. I did it for my monster-in-law with her pc laptop and it was a doddle, plus any time i am up there fixing it for her i take my iBook and it connects straight away. Good luck, let us know how you get on.
Pinkster