[4][5] The vehicle obtained seems, on close examination of photographs[citation needed], not to be Christie's prototype M1931 but a production "T3 Medium", the US Army having decided to replace this model c1934.

[citation needed] After trials it was sent to Morris Commercial Cars Ltd, Birmingham and disassembled for study, Lord Nuffield (head of the Morris companies) had already agreed to buy the patent rights that would allow his company to develop the design that would become the basis of the Cruiser Mk III (A13)[citation needed], extensively redesigned, enlarged and with several faults that Christie had not addressed rectified.

[7] At a meeting of the General Staff, an official specification was determined, which included 30 mm (1.2 in) armour, a 2-pounder gun and a road speed of 30 miles per hour (48 km/h).

A subsequent review of the specification by Martel and Percy Hobart approved 30 mm armour all round provided cross-country speed could be kept at 25 miles per hour (40 km/h).

[8] The Mk III weighed 14 long tons (14 t), had a crew of four, a 340 horsepower (250 kW) engine and a top speed of 30 miles per hour (48 km/h) and was armed with a 2 pounder gun and a machine-gun.