I have NTL for telephone and internet. A few years ago, they were much cheaper than BT which is why I switched. But now, because other providers can use the BT line, better deals and more choice can be had with a BT line.
The problem is... my BT cable is still in my house, but when I was decorating, I removed the box that the phone normally plugs into, and I must have thrown it away. BT allow people to switch back to them at low or no cost if they haven't changed their internal BT line wiring, but if they have, they charge something like £100.
Does anyone know if I can buy a replacement box to screw on the wall. I think I need a 'Master' box which I think has some form of protection in it. I think that the ones you normally buy aren't like this, but BT can find out by testing your line if this 'Master' box isn't fitted.