In 1961, Douglas Wilson-Spratt designed the first WSM Sprite at his Delta Garage in Bedfordshire, England. His Delta Garage partner was Jim McManus, thus the 'WSM' name. The design was based on the engine and chassis of Douglas' Frogeye Sprite with a streamlined body of Douglas' own design. Subsequent interest by the racing public prompted the manufacture of another 10 cars, most of which still survive around the world. Early in 2000, Tony Wilson-Spratt, with his father, decided to build a second-generation of WSM Sprites. Douglas Wilson-Spratt agreed only if they were built as originals - the owner providing the chassis and running gear. The body installation and road worthiness was provided by WSM cars.
WSM 403 was built with left-hand drive for the USA market. This car incorporates a 1964 chassis and a 1275cc engine. The lightweight fiberglass construction and aerodynamic shape combine to make an excellent GT.