A special car, EX120 had been developed from the M-Type for George Eyston to make an attempt on the 750 cc class 24-hour record at Autodrome de Montlhéry in France.

The car used a tuned short-stroke (73 mm) version of the bevel gear driven overhead camshaft engine from the 1928 Morris Minor and Wolseley 10 with a single SU carburettor and a new crankshaft producing 44 bhp (33 kW) at 6400 rpm.

It could from 1932 be had with the crossflow head to be seen later on the MG J-type and a Powerplus supercharger version was also available with 52.4 bhp (39.1 kW) at 6500 rpm.

The suspension used half-elliptic springs and Hartford friction shock absorbers with rigid front and rear axles and centre lock wire wheels.

The body, which had no doors, was metal over an ash frame and had a pointed tail which held the spare wheel and cycle type front wings.