Ive herd horror stories about BT's BB, I used to work for an ISP and BT just stick all home users on 1 line and forget about them, you only get a good service if you are a business with BT or you pay through the nose for it, so im told.
Any how if you want business connection BB for £26.99 per month + VAT let me know i'll get the ISP to contact you about it.
Good things about this is they only supply business use not personal and therefore if you use the internet at night when the businesses arent on line you get a faster connection as your not sharing the pipe
They will supply to personal for me cause i know them well
If you wana know more PM me