Its BT, thats the problem!
We had BT before we moved, prior to that my wife was living in a shared student house and they had BT, a friend was the person on the bill (BT won't have more than one person on the bill for some reason, even refuse to have Mr + Mrs)
Alice - the friend moved out of the house at the end of the first year and the bill was put in Mrs Black sheep's name, supposedly, but all bills were still in Alices name and paid on time by the housemates living there and the account closed when they all moved out.
we got married and Mrs Black Sheep set up BT at our new house
when we closed the account they at first refused to speak to her because she wasn't Alice! It was a completely different account number and address!
Orange have also had a copy of our marriage certificate but for some reason they haven't changed it from her maiden name and when told she needed to send her marriage certificate in replied "you have a copy, I can't be bothered"