Originally Posted by Tristan

Um... If it was the case, NTL would be in a lot of trouble for also broadcasting versions of BBC channels taken from satellite (as they do for the four regional variations, and the AD channels).

Also, I'm pretty sure that (at least) ITV 1 and 2 and Channel 4 and 5 are taken from the local DTT feed, or at least they were a couple of years ago when I was first learning about these things. It used to be the case that you could tell the DTT-sourced channels because they were the ones that used DVB subtitles (as Sky don't support these). I don't know whether this is still true though.