It's not so much a "Commonwealth" version as the beginnings of a special forces version.
Vickers "K"(also apparently known as "GO" - Gas Operated) guns were mounted on special forces jeeps (LRDG, SAS and Airborne). These were intended as aircraft armament, but were released to the special forces when they were replaced in RAF service. On the early, non-standardised Jeep conversion (most commonly used by the SAS in North Africa), there was normally a pair of K guns fitted facing forwards in front of the passenger's seat and a twin or single K gun on a pedestal behind the passenger. A few vehicles carried the .50 cal, but it was an earlier version than the one shown in your drawing, with a perforated sleeve (like the .30 cal). If carried, it was mounted facing forwards in front of the passenger seat. These improvised vehicles carried racks of jerrycans and had the radiator grille cut away and a condenser mounted on the front.
Later in the war the British standardised the conversion for use by the SAS (although there seem to have been variations in the details). This had the twin K guns on the front (sometimes just a single gun), a Bren gun on the side just forward of the driver, and a single K gun mounted on the rear (not always fitted). Of course, there were variations, but this was the normal load out. The .50 cal doesn't seem to have been carried (in fact it was pretty rare on all non-US Jeeps).
These modified Jeeps also had an armoured shield for the driver, and distinctive curved windshields for the driver and gunner (sometimes rectangular, and not always fitted). It was at this stage that the special fuel tanks shown in your drawing appeared - they were normally higher and more rounded than those in your drawing, but there seem to have been variations in the design. The armoured panel on the rear extended further down than in your drawing, and the edges were rounded. The spare tyre was moved to the bonnet. The radiator grille also seems to have been modified - cut away entirely on some vehicles. The 1st and 2nd photos below show examples of SAS vehicles in service in NW Europe.
The Airborne Recce version (as used at Arnhem in 1944) was a stripped-down Jeep which normally had a single K gun mounted in front of the passenger seat. The folding windscreen was removed, and the spare wheel was moved to the front (apparently to reduce shrapnel damage to the engine). There were other modifications to save weight and make it easier to fit it into a glider - many fittings were removed, and the pioneer tools were mounted on the bumper. There were several variations depending on its intended role. The 3rd photo below shows a typical Airborne Recce vehicle.
So if you were looking at providing a kit which an accurately depicts a late war SAS Jeep, it would need quite a lot of additional parts. The early SAS Jeep is easier - your forthcoming Allied stowage set will obviously supply most of the soft stowage and jerrycans needed, so it would just be a case of providing the K guns, condenser and maybe some stowage (and the crew!). An Airborne Recce Jeep would be quite a simple variant to depict.
I hope that helps.
