"We were getting more talented and George began to write lots of songs… he was lucky to get a track on an album." The lost 1971 John Lennon and Yoko Ono interview on the Beatles' split when they insisted Michael Parkinson wore a black sack over his head

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The late Michael Parkinson is rightly regarded as one of the premier television interviewers in the UK and the list of stars that appeared on his BBC chat show encompassed nearly every big name from the '70s to the early 2000s. It's a surprised then to discover that the BBC wiped most of its first series – including a bizarre but revealing 1971 appearance by John Lennon and Yoko Ono.

This wasn't unusual at the time; for reasons cited including the broadcaster having no concrete policy on archiving until 1978 and simply needing to wipe tapes so they could be reused, or destroyed as they weren't deemed of value. This meant early episodes of iconic shows including Dr Who, Not Only Peter Cook By Dudley Moore, Hancocks Half Hour, Steptoe And Son and The Avengers were lost forever. Mostly…