ADSL ISP in UK

[Dave Howorth <dhoworth@mrc-lmb.cam.ac.uk>]

Hi,

Does anybody have any recommendations or warnings about ADSL ISPs in the 
UK? I will also need (perhaps as part of the package) a mail address.

(I'm currently with BTO but their refusal to support anything other than 
Outlook Express has finally stung me into action.).

Thanks, Dave