Thanks guys!
Charl - I didn't do the entire flight, I took off from London City! Would have probably missed the Palace entirely had I started from Biggin Hill
Ian - heh. Yes, it's the Just Flight-published version of the AH FS2004 Lancaster which tends to be more commonly available up here. It works well in FSX with a bit of persuasion with the only real issue being some of the clickable controls in the VC don't work. The scenery is VFR London X by Aerosoft and Horizon Simulations. I've just moved up to Win 7 x64, a GTX580 and a 24 inch widescreen monitor and was really pleased with this scenery which is very intensive but is running at about 25FPS here maxed out

. Under XP and my GTX295 I had to turn everything down and still got a slide show.
07moffata, Olderndirt - love the idea of a composite with the crowds! Thinking about it I should've made the weather more overcast too. Could have used real-world weather actually, as the conditions are still similar here to on the day.
Splitpin - I'll be back to flying over wonderful empty NZ landscapes soon. I'm doing a complete reinstall of FSX following my upgrade. FTX AU and the UK down, NZ is next. I always leave NZ until last as that's the one I keep tweaking and adding to!
Ade