Richard,
Having followed this thread with interest, prompted me to look though some old litrature. I have just come across a sales catalogue from a dispersal sale at Mount Farm in Oxfordshire, during September 1946. Detailed therein are vehicle types, along with their WD or Reg number. Having made a list of all of the ex RAF vehicles sold over 3 days, of which there are some very interesting vehicles listed and their RAF numbers, it would appear that vehicles entering RAF service, were basically issued any number, and not from a block of allocated numbers for vehicle types. As an example, there were two Hillman 10hp 4 Dr saloons sold, one carried the number RAF 14865, whilst the other car was numbered RAF 69760, and a third Hillman 10hp (albeit a Utility) RAF 102625. Another car, a Vauxhall 25 hp 4 Dr saloon, was numbered RAF 3071, whilst a Morris 8 2 Dr saloon was number RAF160247. 3 Standard 12 hp Utiliies carried the numbers RAF 53759, 10520 and 10990. My guess is that the smaller numbers were earlier vehicles, whilst the higher numbers were for the later vehicles. Having said all that unfortunately, there are no numbers for Humber cars.
Not sure if this helps or not
Keith
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