Ken Osbourn writes:-
I was there – it was known as “Operation Vague One” and involved the RAF participation in the repatriation of the body of the Duke of Windsor to England. I think that the actual date of the live event was 31/5/1972. https://youtu.be/Eurv2p8TvdQ I have no idea whether the pictures in the YouTube link are those from Lo21. The Duke of Windsor was formerly Edward VIII, King of the UK and Emperor of India from 20th Jan 1936 until his abdication on 11th Dec of the same year. He died on 28th May 1972 in Paris, so the 29th would fit in with a rapid deployment of Lo21 to RAF Benson.