agreed, pipex are one of the last PROPER isps... you wont go wrong with them.
i'm personally with Virgin media (cable) and have always been impressed with the service (from a technical standpoint, customer service is the worse i've ever seen!)
unfortunately now Virgin have started introducing traffic throttling, which drops the speed to an unacceptable level. If it wasnt fopr the fact that they upgraded me for free i would have told them to f**k off
(i was on the 4mb package which throttled down to 1mb after 3Gb of usage - now i'm on the 20mb package which throttles down to 4mb, so i'm no worse off than i was)
ps with 20meg broadband it takes me 4 minutes to download a movie