Yea! I noticed that as well, as my B/in/Law has H/D with Sky and his picture quality is not that good compared to our TV Dive box with Telewest. I have also noticed that when viewing H/D the sound quality is a lot better as well.
Mind you we only have the one H/D Channel just now, as the other one was taken off air, but according to Telewest that could be changing in April
