Im with Telewest/Virginmedia. If you mean teleport tv, i think you only get that free if you have the supreme tv package. I have that mainly for the amount of kids channels for my daughter, but its very rare i use teleport tbh. Ive watched a few spooks on it but thats all really.
If you only have the basic package i think it may charge you per programme watched.
Oh and to use it press the telewest button, choose teleport tv then find a series you like and then just 'OK' on the episode you want.