G'day Garrycol

As far as I know they were fitted with compliance plates on the front radiator panel, the late Series 2a's did, it would also have the Leyland plates on the inside of the firewall just in front of the gear levers, these would be the Rover/Leyland vehicle plate and the Pressed Metal Corp. body plate the one on the upper surface of the radiator panel is about 2" x 3" from memory reverse stamped, it could be painted over, a good way to check if it is Military, is check if it has a raised chassis like the 2a's as the earlier ones did

The Military Nomenclature Plates should be on the left end of the seat box.

hope that helps