If anyone is interested my son showed me this website
MyP2P.eu :: Watch LiveTV for free on your pc, just like your home tv!. You can watch ITV 1,2,3, & 4 very clearly, on it. I've only just had a look myself so I don't know if it's always this clear plus it's a small picture, but still. He watches lots of live sport and he downloads lots of U.S. TV series (e.g. Lost) which we watch on the computer and the quality is excellent. First time I've looked at UK programmes though - and definately not the last!