It was a subsidiary of the Tunex Conversions Co set up by Don Sim in Camberwell, London, but in 1966 Diva Cars Limited became its registered name.
The first Diva was intended to demonstrate Tunex's technology and had a body built by Heron Plastics and was a development of their 750 model.
A mid-engined Diva, the Demon, was exhibited at the 1965 Racing Car Show in London using a mid-mounted Hillman Imp engine.
This was changed later in the year for a Ford 1500 cc unit and the car was launched as the Valkyr.
The only car designed specifically for road rather than racing was the 10F, a version of the GT which used thicker fibreglass bodywork and a flexibly mounted engine.