After the First World War, the company introduced an easily changed rear wheel, which customers had been seeking a number of years. The 1921 Popular, powered by an 8 hp (6.0 kW; 8.1 PS) JAP and bodied in poplar, sold for £150. It was a sales success, the price dropping to £128, and the name changing to Standard, by 1923, when a Blackburne engine was also available. The Grand Prix was priced £155, and the Family (with two notional child seats behind the front bench, setting a standard 2+2s would follow for generations) was £148 (air-cooled engine) or £158 (water-cooled engine). The Anzani-powered Aero was also available, for £148. MAG engines were also optional.