Most RRians are too young to remember Checkmate, but it was a fine show that ran in the early 60s. I watched it and later discovered the spy novels of the man who invented the show, Eric Ambler. I think Lynch and Frost must have watched the show and used its credit font for Twin Peaks.
The World at War and WW 2 in Colour are both great.
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Whoever made the video about the World at War claimed the little boy in the video was dead, and apparently he's British, Aussie now, and very alive or was 3 years ago.