Channel 4

[Markymark]

I've just noticed, C4HD on DTT and D-Sat has a vertical timing delay of about 15 to 20 lines (so in effect a black band at the top of the picture) However, it's only on ITN's output, and not in the ad breaks.

You'll only see it if your telly is set to 1:1 pixel (overscan off) mode