Jee, you are trying to change history , the body on your truck is anyway post war , and from a British trailer , your engine is out of a Bedford , so it had a civilian life , and you can`t be sure who slapped a blue color paint on in its past .
So a paper tells you it is from 38 , but the statistics tell us that this model truck was not produced before 1941.
Ok you can paint your vehicle in the color you want , but don`t ask then for correct RAF numbering , because it is going to be bogus at all .