I had the same dilema with BT as no help offered so went from BT Anytime to Pay as you go to keep my mail address etc. and went with Pipex with no regrets and the service is Fassssssssssssst still able to use my mail from BT on a Pipex connection setup from Outlook Express. Broadband is the way ahead but BT need some manners. IMHO.
PS You can even use the laptop at home the same time as BB by connecting the Phone side of the filter.