I have to say though that are BB account was upgraded from dialup and so e-mail addresses were taken from that. I know BT made some changes at the start of the year, but they should be using POP3 and should be perfectly compatible with all e-mail clients.
LeadingMNMs is not quite right, if you sign up with BTBroadband it is a basic connection service witn email service included, you can sign up for an email service for an extra cost or join a free email service such as Yahoo mail or use your old adress with POP3, if you want the full ISP service you have to sign up with BTYahoo, or another provider with full ISP functions.
I use BTYahoo with access through POP3 or the BTYahoo mail.
This has been a common mix up with the two services.
From what you are saying there are two services BT Broadband & BT Yahoo Broadband. I have spent ages looking at all the FAQ's about Broadband & it would appear now that Basic is web based & Yahoo is both web based & POP3.
I have BT Yahoo Anytime at the moment for £15.99 per month and I am very impressed with it. Thanks for your help everyone - I can at least follow it up on a free 0800 number.