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Fellow documentary makers said they were surprised that the mistake was not picked up by ITV and the experienced producers. One of them, Sylvia Jones, used to work on The Cook Report and another, Clive Maltby, was a picture editor on World in Action.

Alan Turnbull, who runs the website secret-bases, said he was approached by the respected independent production company Brook Lapping to use aerial shots of Kent military site Fort Halstead for an episode called Exposure: The World's Deadliest Arms Race.