Sir John Carden of Vickers Armstrongs designed the Cruiser Mk II to be an infantry support version of the A9 in 1934. It was decided it needed to be slower and have thicker armor.
Twin "sub-turrets" were removed which allowed for more room for ammunition. It had the same turret and shaped hull, but it had additional armor bolted on the hull and turret. Gunner controlled the elevation of the gun with his shoulder.