This is very straightforward.
You simply need to run a coax cable (normal 75 Ohm arial cable) between the sky box and your second TV set. Connect one end to the 'UHF 2' socket on the sky box, and the other to the arial input on your TV. Now simply tune your TV until you see the Sky channel.
If you want to control the Sky box from this room, you need to purchase a 'magic eye' for £6 (look at Wizard Satellite). This simply plugs between the arial socket on the second TV and the feed from the Sky box. You will then need to activate the 12v signal on the second UHF output to power the eye. Press SERVICES 4 0 1 SELECT, and then choose the option to provide power over the UHF output.
CHECK YOUR WIRING FOR SHORTS FIRST !
The small red LED on the magic eye should light up.
Point the Sky remote at it, and you should be able to control the Sky box from this location. Note that both TV's will display the same channel. You can't watch two different Sky channels.