The combination wartime ride was the enlarged BSA single, the 600cc M21. Again my grandfather George Lawrie is seen atop this machine during traffic control and other MP duties in Egypt, through Tunisia and Libya. No doubt shadowing Monty's Eighth Army as they chased Rommel 'The Desert Fox' back through El Alamein into Tunisia. Amongst his medals and cap badge is a cloth badge of the Jerboa, used as the Desert Rats insignia of the 7th Armoured.
Here's a recently restored hack with sidecar trunk in lieu of the chair; also emblazoned with the AA (Automobile Association) emblem. George was an AA man both before and after the war, the roadside assistance skills being useful for MP work; and, indeed many AA men ended up in that branch of service.