Norman.
The Internet ignorance on this site is just amazing.
Anyone that has BT only has to shut his router down overnight or even for a few hours and BT give you a different ISP.
They do not give anyone a fixed ISP.
The reason being any ISP not being used periodically they can give to someone else without having zillions of ISPs (logical innit)
I told you all this years ago.
I have never changed my BT and BT would not allow it.

Is someone going to block this before anyone has seen it...