Not much help, but some notes I made years ago (probably based on info. in Brian Leigh Davis's "British Army Uniforms and Equipment of World War Two".
Officer Cadets being trained at Officer Cadet Training Units wore a white cloth band around the lower part of their headress, in June 1940 it was decided that a similar distinction would be worn around the base of each shoulder strap, the white cloth being locally procured by units.
In June 1941, RAC Officer Cadets were authorised to wear a 1 3/4" diameter white ivorine (a type of plastic material) disc as a backing to their badge worn on the black beret (the black beret was known as the "cap, RTR"). White ivorine lozenges were also worn.
As an economy measure, a later instruction of October 1942 introduced a white peak to be worn with the Field Sevice Cap (sidecap) rather than the white band, in Septemeber 1943, with the introduction of the floppy beret like General Service Cap, the cloth FSC peak, the white ivorine disc & lozenge were replaced with a 3" diameter white ivorine disc.
Current stocks of white peaks were to be used up before the 3" diameter discs were worn, the white ivorine lozenges continued in wear by RAC OCTU Cadets until supplies were used up (exceptions to the use of the 3" disc included Cadets authorised to wear Service Dress Caps who were reissued white cap bands).
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