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TTN, IIRC the RAF had shorthand writers but I also think the trade was abolished in the 1990s purge of trades.
Yes it was in the seventies that they formed, I remember because the Sgt Admin on 240 OCU applied for it and was posted onto what I believe was one of the first courses. I asked why and he told me it was a well paid job out of RAF life and he was planning ahead.