Our Area Radar course assembled at RAF Sopley in 1970, and were directed to SHQ for processing. The Sgt Admin looked at our assorted Fs 1771, handed us blank ones, and instructed us on what to claim (in addition to mileage). There were numerous little allowances we had never heard of that were duly, and legally, claimed and paid.
OTOH, my wife was Desk Officer for Allowances at Adastral in the 80s, and filtered all sorts of spurious claims across the spectrum. That culminated in being the Specialist Witness at a Boarding School Allowance (as was) CM of a personal friend. Not a nice experience.
So much for the “Trusty and well beloved” on the Commissioning parchment. 👎