Ashley were manufacturers of body shells and chassis for specials from 1955 to 1962. They also offered a range of products for special builds: radiators, header tanks, lighting sets, steel tubing, sheet aluminium, various suspension parts, water pumps, tires, tubes and wheels. The company also made bonnets and hardtops for other mass-produced sports cars, including the Austin-Healey Sprite and Jaguar E-Type.

A kit car is an automobile available as a set of parts that a manufacturer sells and the buyer then assembles into a functioning car. Usually, many of the major mechanical systems such as the engine and transmission are sourced from donor vehicles or purchased new from other vendors. Kits vary in completeness, consisting of as little as a book of plans, or as much as a complete set with all components to assemble into a fully operational vehicle such as those from Caterham.