It was filmed by the late Ted Ashman who was chief photographer at Filton from just after the war up to the early 1980s.
His career started with the Bristol Aeroplane Company, then on to the British Aircraft Corporation and subsequently BAe.
Although mainly a stills photographer, he also filmed the aircraft and his son Stuart Ashman found the old film cans in his shed.
“I thought it might be footage of the Brabazon but I had never seen it and had no idea what was on it.
“At Filton my father recorded all stages of production as well as first flights and ‘air-to-air’ photography.