Not ASFIK, its because ITV are not using the normal H.264 compression for Mpeg4, ITV are using ( i think ) H.262.

So normal HD receivers can't see it, I do know that some guys with HD receivers have managed to get it so that gives us DB800 a chance.

What concerns me is I am sure H.262 is inferior to H.264 so why use it in the first place ?
I think its because they want to keep it on theis new freesat service only.