The car was built by the Swallow Coachbuilding Company Ltd., a Tube Investments Group subsidiary bought for its 1935–1946 association with Jaguar's prewar motorcycle sidecars.

The Doretti name was derived from Dorothy Deen, who managed the Western US distributorship Cal Sales.

He is building a new limited edition sports car called the Doretti TR250 'Corsa Veloce' using the Ferrari TR 250 chassis and engine from 1957.

Most cars were supplied with Laycock-de Normanville electric epicyclic overdrive and they were capable of 100 mph.

[citation needed] Three prototype Mk II cars, called Sabres, were produced.

directors by the British motor industry, most notably Jaguar, alleged that Doretti production created a conflict of interest for T.I.