The Riley One-Point-Five and similar Wolseley 1500 were motor vehicles based on the Morris Minor floorpan, suspension and steering but fitted with the larger 1489 cc B-Series engine and MG Magnette gearbox. Launched in 1957, the twins were differentiated by nearly 20 hp (15 kW), the Riley having twin SU carburettors giving it the most power at 68 hp (50 kW). The Wolseley was released in April of that year, while the Riley appeared in November, directly after the 1957 London Motor Show. The Wolseley also had a Series III launched in October 1961 which featured a revised grille and rear lights.