The last unique Riley Cars before the badge-engineered BMC Rileys.Riley had been absorbed into the Nuffield Organisation in 1937, and the 12/4 and 16/4 of that time formed the foundation of the post-war Riley RM models. The RMA was launched first in 1945 with the 1496cc 4-cylinder engine from the 12/4 in a fairly traditional design but with independent front suspension. The RMB was launched early in 1946 as a longer car with the 2443cc twin cam engine from the 16/4. In 1948 the RMC was announced as a special-bodied 3-seater convertible based on the 2½litre RMB with cutaway doors. It was supposed to appeal to the American market but sold only 500 copies and was withdrawn in 1951. At the same the RMD 4/5-seater drophead coupe was launched mainly for the home market, but sold no better than the RMC and was also dropped in 1951 after just 500 copies. In 1952 the surviving RM models were updated with larger rear windows and different axle ratios to be sold as the 1½litre Riley RME and the 2½litre Riley RMF. The RMF was the first to cease production as the 2½litre car gave way to Gerald Palmer's Riley RMH Pathfinder in 1953. The RME clung on a further 2 years, losing its running boards in 1954, and then being superceded by the Wolseley 1500/Riley One-Point-Five cars in 1955.
Donald Healey used the Riley 2443cc engine in his own chassis to create his own Healey cars from 1947 to 1952