The Riley One-Point-Five and similar Wolseley 1500 were based on the Morris Minor floorpan, suspension and steering but fitted with the larger 1489cc B-Series engine and MG Magnette gearbox. Launched in 1957, the twins were differentiated by nearly 20hp (15kW), the Riley having twin SU carburettors giving it the most power at 68hp (50kW). The Wolseley was released in April of that year, while the Riley appeared in November, directly after the 1957 London Motor ShowThe Series II model came out in May 1960. The most notable external difference was the hidden boot and bonnet hinges. Interior storage was improved with the fitting of a full width parcel shelf directly beneath the faciaThe Wolseley also had a Series III launched in October 1961 which featured a revised grille and rear lights.