The 1982 television programme "Hang-on I'll Speak to the World" is not really about engineering, but it does include some behind-the-scenes information and images that show how the BBC's engineering systems were used. Here are the links to parts 1, 2, 3 and 4 on YouTube. (Links recommended by Dave Porter.)
This bit of trivia might bring back memories: "Test card girl 'bemused' by her return to British television".
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