[MikeyB]

I would say pretty much all the channels I used to watch, BBC1,BBC2,C4,Sky1,Paramount,music etc

The difference was noticable straight away, definatly more stereo seperation (and thus more noticble Pro Logic) on Sky than NTL, and seemed somewhat clearer sound.
And the only thing that changed when going from NTL to Sky was the STB, same tv, same scart cable, same sound system.

But I've not had NTL for 3 or 4 years now, didnt stay with NTL for long once it went digital, parents had Sky and was jelous by how good theirs was!