There were other such quirks. I was in the army in the late 60s, and people who had passed their test in a centurion tank not only got a track laying vehicle licence, but also a motorcycle one. This was apparently because the cent. had a foot operated gear change. Makes perfect sense, no?
Also there was a dispensation for the forces which allowed me to learn and take my test on a BSA B40 350cc bike.
Steve