I use Demon, and they're pretty darn good on the whole. They're more expensive than the average UK ISP, but I don't ever remember downtime on ADSL unless it was problems with one of the PCs at my end, IP is nice and static, they provide good newsgroup access including alt.binaries.*, and data transfer is uncapped. I guess the only gripe is lack of 1 mbit for home connections at the moment