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Watching the interview, Prof Geddes says it's clear Heston was "in the midst of mania" at the time.

I recently sat down with world-renowned psychiatrist Prof John Geddes to watch a new BBC new documentary I'd been collaborating on - "Heston: My Life with Bipolar".

"Families fall apart because of the mania more than the depression," says Prof Geddes.

"Someone living with bipolar cannot be separated from it - their personality is entirely and intrinsically connected to the condition," says Prof Geddes.

It was written by his then crewmate Gavin Geddes - who was amazed to be told it had been found 47 years after they dropped it overboard.