My earliest memories of flypasts over London were in the 70's, when 4 X Vulcans from Waddington would fly over Buckingham Palace for the Queens Birthday. They would join up with Buccaneers, Lightnings, Phantoms etc on route, not much information was given out about the formations at that time.
It's was only in the 90's onwards when details were released about the route of the formations, and the aircraft involved and where to see them on route. I have tried to find details myself about different flypasts over the years but not much success!