I was in my room in one of the South Woodford tower block QMC Halls Of Residence in the early '70s when the noise of traffic on the A11 was suddenly eclipsed by The Sound of Freedom as a formation for some Buck House flypast went directly overhead. I recall that the weather wasn't all that great either....
On that point, I was going to take part in some flypast or other over London once - until it was noticed that whoever had drafted the Op Order hadn't a clue about fixed wing visibility limits and had proposed absurdly low limits. Officialdom thought it would be too risky to send out an amendment in the time available, so the whole thing was canned - and no doubt someone was invited for an Axminster shuffle!