V bomber mass formation in 1960s

Back in about the summer of 1963 whilst a young spotter at Baginton Coventry I saw a mass formation of V bombers, Vulcans, Victors and Valiants fly overhead at about 15000 feet, perhaps a bit higher as some were contrailing, but I could just about get the serial numbers off a couple with my fairly powerful telescope. They were all in the anti flash white and travelling in a east to west direction.
It was a weekday at probably early afternoon. There could easily have been upwards of 40 aircraft, travelling in waves.
Anybody no what this exercise was all about and any other details.