I had a quick look at this yesterday. with the CAA stats for December, and got the following:
MAN 83%
LHR 87%
I don't have the figures to hand today, but the issue here is that the stats just give airport to airport traffic, not carrier. I assume its just BA with their 3*772 and EK with their planes. What we don't know is the airline load factors, but at 83% I have an idea that the flights were pretty close to full on most dates (except probably Christmas day).