This is a 1:100 scale model for 15mm wargaming.
The ZIP file contains two STLs, one for the turret and another for the body of the vehicle.
The Lanchester Mk.II was a large, heavy armoured car, in use by the British army in the interwar period right up to the first days of WWII. It was replaced on the outbreak of war by the Morris CS9, but it was retained in second-line service in the UK, and it saw front-line action in Asia against the Japanese. It was heavily armed, with both a .50 and .303 Vickers in the turret, and another .303 Vickers in the hull front.