The RM Series cars were the last 'proper' Rileys - the swansong of the marque before it was subsumed into the mighty British Motor Corporation.

The model range was manufactured in Coventry until 1949, when production moved to the MG factory at Abingdon.

The RMC and RMD were limited edition Roadsters.

While the latter was a conventional two-door Drophead Coupe, the RMC was a far more distinctive variant primarily designed for export to North America.

Ostensibly a two-door convertible version of the RMB, it featured a three-abreast front seat, cutaway doors, foldaway hood, large rear stowage area, fold flat windscreen and lower bonnet line.

The 2.5-litre four-cylinder powerplant was also unusual in having twin push rod-operated camshafts placed high in the cylinder block.

The unit's output was circa 100bhp at 4,500 rpm - sufficient to accelerate the big Riley to 60mph in around 16.5 seconds and on to a genuine 100mph.

Only 507 examples of the RMC are understood to have been produc...