The Man-U match was widescreen, while the Chelsea match was 4:3. This is due to it being foreign, and the United match UK local. ITV, like all the other UK broadcasters, just take whatever the local broadcasters use. We're about the only ones who regularly use 16:9.
What is annoying is that they put a 4:3 feed into a 16:9 broadcast, thus forcing the left and right black bars. If they just left it as a 4:3 broadcast it would allow us to use a non-linear stretch, or a zoom, to suit ourselves.
But SuzyG is quite correct. Switching the Sky box to 4:3 solves the problem. It's a pain but not too bad a fix.
I reckon Liverpool are going to face a much tougher opposition tonight and I think that they have to make sure they aren't complacent. 90 minutes is a long time but as long as Liverpool do what they usually do at home it should be all good.
assuming Liverpool go through it would be three English teams in the semi-finals and a guarantee of one in the finals plus it's almost a certainty that man United will win as well... Possibly making it an English final... That would be a first in European Cup/Champions' League football, right?