The company was founded in 1967 when Bernard Cox and his friend Jack Hosker created the Cox GTM (Grand Touring Mini) a mid engined Ferrari Dino inspired sports car based on Mini parts. It was an instant hit and they built kits as fast as they could in their garage in Hazel Grove, Stockport. In the autumn of 1968, Bernard Cox decided to stop production after 50 kits. In 2003 GTM Cars was bought by RDM Group, and in 2004 the company moved to Coventry. In December 2007 GTM Cars Ltd., came under the new ownership of the parent company Potenza Sports Cars, owners of Westfield Sportscars.