The A.A. Hut, Motor Cycle Patrol and Guides, was introduced, along with the RAC set, in the same Meccano Magazine issue of October 1935. I believe that the A.A. was another automotive service club, open to membership to car owners. They also provided roadside assistance with roving patrols, and also had these AA huts stationed on various roadways, available to members. The AA Hut is quite a bit larger than the RAC version, and is also more complicated, with its three moving banners on the top. It features the same guides, but now in the uniforms of the AA. Also of interest, the scenery used as a backdrop differs from the RAC.
Best regards, Terry