What we do know is that Skynet-1A was manufactured in the US by the now defunct Philco Ford aerospace company and put in space by a US Air Force Delta rocket.

“The first Skynet satellite revolutionised UK telecommunications capacity, permitting London to securely communicate with British forces as far away as Singapore. However, from a technological standpoint, Skynet-1A was more American than British since the United States both built and launched it,” remarked Dr Aaron Bateman in a recent paper on the history of the Skynet programme, which is now on its fifth generation.

This view is confirmed by Graham Davison who flew Skynet-1A in the early 70s from its UK operations centre at RAF Oakhanger in Hampshire.

“The Americans originally controlled the satellite in orbit. They tested all of our software against theirs, before then eventually handing over control to the RAF,” the long-retired engineer told me.

“In essence, there was dual control, but when or why Skynet-1A might have been handed back to the Americans, which seems likely – I’m afraid I can’t remember,” says Mr Davison, who is now in his 80s.