FV 215b (183) Conqueror was A semi-SPG design with a FV200 chassis mounting on a limited traverse turret armed with a 183mm gun. Only one wooden mock-up was produced. This proposed heavy self-propelled gun utilized components of the Mk. II Conqueror. The vehicle featured the gun in a rear-mounted rotating turret. The project was canceled in the 1950s and it never saw military service.