ISTR the Flypast in 1953 (all 600!) was across The Mall rather than down/up it'. Good positive clearance' of weather too, post Cold Front? Suspect it was a coldish Warm Sector 'for most of the morning and early afternoon but, perhaps our resident Met Man could do an aftercast' please? All recalled distantly from the memory of a 16 year old Programme Seller' at the time.
AD.