Group Racing Developments
 Group Racing Developments known more simply as GRD was a short-lived British constructor of racing cars. It was formed in 1971 with a large percentage of staff coming from those made redundant from the closure of Lotus Cars customer car manufacturing arm. They built cars for Formula 2 Formula 3 Formula Atlantic and Sports 2000 racing classes until a decline in British racing vehicle manufacturing bit into the industry in 1975 that paralleled the oil crisis.