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Yep, if you see someone on a scooter with a clipboard attached to the handlebars it's quite likely to be someone studying for The Knowledge.
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I know this from the "Up" series [1] from the late Michael Apted.

Tony got his "knowledge" around "21-Up" in the series, became a London cabby by "28-Up" [2].

[1] https://en.wikipedia.org/wiki/Up_(film_series)

[2] https://youtu.be/_rQ1V7m0Kfs?t=142

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The Knowledge is exactly the first thing to get into my mind the moment I read the headline.
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Made me think of this as well.

If I remember the story I read correctly, they just call it "The Knowledge". What a great name.

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There is also a very good TV comedy-drama film of 1979 about some characters working towards passing the Knowledge exam. The film was, of course, called The Knowledge:

https://en.wikipedia.org/wiki/The_Knowledge_(film)

It's available on YouTube (potential geoblocking notwithstanding):

https://www.youtube.com/watch?v=oSAAB1ZmudY

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