find someone who works for bt who can look at contact details, bund them a few quid and hey presto.

Something else i remember my mate did years ago way call the person out the blue, if said he was from there mobile company, knew they were on orange. You could say from bt internet! Say you have a few question for them and they will recieve 1 months free service if they answer them. When they say ok, quote them there email address, you have it, they woill say thats it, then ask them to confirm there address. Once they do, say fucker, then hang up.