The Myth Makers, by Ian Z. Potter (and Donald Cotton)
When I first listened to the audio of this lost story, with linking dialogue read by Peter Purves, in 2007, I wrote:

The Myth Makers was the four-part story between the single-episode, Doctor-less Mission to the Unknown and the twelve-par
https://fromtheheartofeurope.eu/the-myth-makers-by-ian-z-potter-and-donald-cotton/
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