Note the motorcyle despatch rider (easily recognizable by the signalman armlets on both sleeves and the round helmet) is wearing the early pattern motorcycle coat.
The stowage on the vehicles is a disgrace, indicating a very abrupt loading and/or short distance movement - another indication that it is an exercise rather than a planned move, in my opinion. They look like gypsies.
The diamond shaped tactical marking on the 8-cwt I recognize, but what is on the windshield in the centre of the jeep, between the unit sign and the division sign?
Interesting WD number placement on the 8-cwt, too.