G-YMM* are RR Trents and ALL have the 18 channel big screen system
G-ZZZ* & G-VII* are GEs and some have the crappy Marconi system but some have the newer one... there was a list posted a while back of exactly which had and which didn't but with the search down its impossible to find.

They were supposed to have been retrofitting the newer system to the rest of the VII* fleet but it never seems to have grown more than the inital pre-911 batch that were done. I suspect that it was put on hold due to all the cutbacks and now that money is flowing again so much time has passed that even that system is archaic comapred to the competition- so now its on hold pending the VOD decision.

Just load your laptop up with DIVXs!