Many thanks for all the replies, after a bit of googling I think that I'll switch to UK-Online who provide an unlimited 8Mb download and 768Kb Upload for the same money as NTL's pitifull 2Mb service (I may even stretch to the 22Mb service for a few quid more).
http://www.ukonline.net/broadband/comparisononnet.php
I'll probably switch the TV and telephone services to another provider as well, since the main reason for me subscribing to cable was for the broadband services that were better than anything else around at the time.
Many thanks to all that replied