The British Mark IIA Cruiser Tank A10 was similar in appearance to the A9, the A10 shared the same designer and almost parallel development periods, with the main differences being the increase in thickness of the armour from 4mm to 30mm. As the vehicle shared the same AEC Type A A.179 engine as the A9, the increased weight of the thicker armour reduced the top road speed to 26km/h.
It was equipped with a 2 ponder (40mm) main gun in the main turret. It lacked the two small traversing turrets, which each mounted a .303 MG as used in the A9 Cruiser. This reduced the crew to 5. It also had a Besa 7.92mm MG.
Production began in 1938, 10 by Vickers, 45 from Birmingham Railway Carriage Co and 45 from Metropolitan-Cammell. A further order of 100 were placed with Birmingham Railway Carriage Co in 1939.
The British Mark IIA Cruiser Tank A10 participated in operations in France during 1940 and later in Western Desert in 1941.