40/50 bhp, 7,668 cc overhead-valve six-cylinder engine, four-speed manual transmission, solid front axle with semi-elliptic leaf springs, live rear axle with cantilever leaf springs, and four-wheel servo-assisted brakes.

Wheelbase: 3,822.7 mm Even in the rarefied world of Rolls-Royce, where every car is a reflection of its owner’s whims and is therefore different, a beautiful thing sometimes bears repeating.

The factory was so thrilled by the success of its 1927/28 Riviera trials car, which was a Barker-bodied open touring on chassis 21UF, that it produced a second car on factory experimental chassis 15EX, which was finished to exactly the same specifications as 21UF, save for a rear-mounted spare, and they used it as a “propaganda car” (demonstrator) at German shows.

A third and final car was eventually built to the design, and it was identical to its predecessors down to its colour scheme of cream bodywork with its polished aluminium bonnet, scuttle and wings, and upholstery, whic...