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I thought it just said photographer Mark Harrison worked on the interview and he had an incriminating photo. Maybe not a photo taken during that interview, but before times? Maybe him having the photo was what persuaded NoSweat to agree to the interview.
That was my between-the-lines reading e.g:
“may feature in a forthcoming film about how the BBC secured the interview” and “There is a lot more from that day that is not yet in the public domain” and “ It was not one of the shots the BBC released.”