Joined ICUK in Feb 2007 after moving to a village where BT will not offer broadband at all and after a living mightmare with Tiscali in last home. ICUK charged for connection and could only provide 512K. The speed may be low but is consistent. Service support for help & advice is simply excellent. No billing problems so far. I have a completely unlimited download contract but I note that the advertised offers seem to have changed recently and unlimited has more or less vanished. I\'m happy to recommend ICUK. Quite amazing compared to the stress of trying to use Tiscali.
UPDATE Oct 2008,
I have since moved home and stayed with ICUK. Now have the up to 8Meg service with 5GB/month at £17.50. Speed is great usually around 6Mbps. Service remains first class. I had a speed problem one Saturday afternoon and emailed for help. The reply came in minutes and after exchanging a few messages the problem was resolved.
I don't care what anyone else charges, what I've got is something that works and people ready and willing to support me if I need help.
Simply brilliant!