Splitting Cable TV Signal - Telewest

[ScarySquirrel]

First off, didn;t know where to put this, so move if need be.

I have Telewest Phone, TV and Internet Services. The TV goes through to my room, but my sisters wants to split the signal into the living room as well, i know this will mean whatever the box is selected to both channels will be on but does anyone know if there is just a little splitter i can get for where the Signal comes in at the wall to split the signal to two TVs?

Secondly, am i allowed to do this?>

Thanks in advance

 

[ScarySquirrel]

oh i see, the only problem with this is that the other TV is in the other room.

Why would you only get a few channels, surely if you have the splitter AFTER the box, it would just relay the same signal to the two TVs? or would that effect the picture/sound quality?