Pipex don't charge setup/installation. Just £19.99 a month plus VAT. Provide your own modem if you like.
Works fine, most of the time.
BUT there is NO Pipex helpdesk/call centre. They claim there is, but that's a myth. I know, I've tried to phone it dozens of times. Never yet got a human on the other end.
There's also a black hole called the Pipex online fault reporting service. That doesn't do anything with faults reported. Nobody calls back, nothing happens.
The good news is that line faults cure themselves in an hour or two, and there are some fabulous newsgroups where the real experts will advise.
Keep your old dial-up modem (useful for faxing, too) and a freebie ISP for those times you need to access the Internet when Pipex ADSL is down.