I have this router and it is version 3. I got mine from amazon for about £30.
As has been said already, all you should have to do is turn everything off, plug in your telewest modem to the routers WAN or Internet port, hook up all your computers by ethernet, and you are just about done.
Remember to turn on modem first, givie it a minute or two to settle down, then turn on your router, and then finally your computers.
Oh and
to the forums too.