As promised, here is a wee clip of the ITV broadcast done at the 1 hour maximum quality setting. I personally cannot tell much difference between the 1, 2 and 3 hour settings but the quality is there should JD need it.
EDIT - I have changed my mind. On a 42" Plasma telly, the 2 and 3 hour modes are garbage and only the 1 hour mode looks OK.