If you are at all handy, you can buy a kit in any of the big hardware stores to allow you to install extra points yourself. It would cost about €50 tops I imagine. Basically, it will entail plugging the existing cable into a little yoke called a splitter - one lead goes in, but you can run two leads out of it. One of these leads then goes back into your TV in the living room, the other you run up to the bedroom. In the bedroom, you then put the end of the wire into a socket that goes on the wall, into which you will plug the wire from the back of the TV in the bedroom.
That is all NTL will do for you anyway. The advantage of doing it yourself is that you will not have to pay a monthly fee to NTL for the rental of an extra TV point (which you also have to pay them to install).
Re the above message from Meathman:
If it is just a standard NTL cable package, you can watch the same or different channels on each TV at the same time (unlike satellite)