Sorry, Guys, but I think you are both mis-reading it:
It was originally a 'Battery Staff Personnel', later annotated with 'K2' to denote the loading type. The vehicle was later changed to 'GS' by the removal of the internal and external B/S fittings. The opposite (left) page may include a 'G' reference and a date of issue of the change authority.
B/S vehicles came in various loadings (pers, office, comms, etc), ie different fitouts, depending upon function. Most B/S 15cwt trucks were converted to GS configuration in 1943, with the changeover from the standard to tropical war equipment tables (WETs) for Units and Divisions. This meant much, much less transport, and specialised vehicles like the B/S were no longer required in such numbers. Most of their functions in artillery units were taken over by 1/4 ton trucks and trailers. The former B/S vehicles were returned to Ordnance Vehicle Parks, and converted for issue as simple 'GS' trucks.
Mike C
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