Depends what broadband options you have in your area. ADSL and cable have different pricing for connection. I don't know of any broadband service which is pay as you go, they're all always on, with a flat monthly subscription. Cable is usually slightly cheaper/month than BT, and quite a bit cheaper if you have cable TV in the package too.
i`m with ntl they`ve got broadband in my area because they rang me a bit a go to see if i wanted it.glad to hear that it is flat rate just think how much it would if it was pay as you go like it was on dreamcast.