[David_Hayward (RIP)]

I believe that the CMP is in fact to Contract S/M 2029:
there were three batches of UK deliveries, and one at least for the Mid-East. See photo from Imperial War Museum KID 2094. These were # 11 and #12 Cabs, with Duple bodies. Also to S/M 2029: DODGE, TRUCK, 8-CWT, PERSONNEL W.D. NUMBERS Z 4613111 – Z 4613593.

The C.8 Personnel in the film has a fictitious census number. but the CGT is to S/M 2028: H 4593648 to H 4594497, the same contract that covered the 2-pounder Anti-tank Portees.