I've just got back into the world of communication after a week away, so was unable to post on here about this one - nice to see the pictures!
Sadly, even though the RAF rules the skies, Air Traffic are the ones that tell you whether you can play there or not - and clearance for anything like this will always result in a straight-through, single transit flypast - otherwise it plays complete havoc with the civvy traffic in the London zone and on the city airport/Heathrow approaches.
The formation then went on to RAF Halton after London, to provide the flypast for the graduation parade of RAF recruits there.
MG Mark