Although Austin had made six-cylinder cars since 1909, most of had been aimed at the chauffeur-driven trade.

By contrast, the 12/6, introduced in January 1931, was intended for the owner-driver and a conscious attempt was made to simplify maintenance and make it easier for the owner to service. This was the first Austin to have an all steel body, manufactured by Pressed Steel of Great Britain.

The 12/6 sold at a rate of 5000 - 6000 per year and was, for a time, the second most popular Austin model after the Seven.