I doubt bluetooth is what you want to be looking at, Bluetooth is for data or audio services only, not video.
If you have a TV output on your computer (or if your TV has a standard VGA input) you can simply link it to the tv using a suitable lead so you can view your computer on the TV
Thank you all for your input.
I think it may be easier to connect an up-to-date iPod to the TV (when I get one)!! I have already seen TV's with built-in docks, although the particular one was too small for the lounge....