Built between 1968 and 1974 the G15 grew from the Walkletts' desire to build an affordable smaller sports car.  To this end, it used a simple 2" ladder frame chassis with a bolt on GRP body.  A complete Hillman Imp Sport drive train was bolted into the rear and front suspension was Triumph Herald/Spitfire.

Around this time Ginetta became members of the SMMT which allowed them to display at the London Motor Show.  The G15 was announced at the 1967 show and several orders were taken. However, due to development problems, no cars were delivered until mid 1968.  These early cars had lay-back indicators, separate sidelights, small side windows and MGB door handles.

This very pretty little car went through several subtle updates until its demise, at the Series 5, in 1974.  Nearly 600 were sold and it has become, perhaps with the G4, Ginetta's best known model.  A contributory factor was undoubtedly its excellent competition history in the hands of drivers like Chris Meek and Allison Davies.