The RP4 is one of a series of lightweight, purpose-built sports-racing cars produced by Royale in the late 1960s and early 1970s.

Known for their agile handling and sophisticated chassis, Royales were designed primarily for club and national circuit racing, competing alongside Chevron, Mallock, Lotus and other small British constructors.

The RP4 exemplified this approach, combining a semi-monocoque chassis with double wishbone suspension, telescopic dampers and rose-jointed control arms, resulting in a car that was exceptionally responsive on track.

With a ludicrously low dry weight of just 463 kilograms, coupled with disc brakes on all four corners and a dry sump lubrication system, the Royale was highly competitive in period and a favourite among privateer racers seeking performance without excessive complexity.

This example is offered as an unfinished project following the unfortunate passing of the vendor’s late husband, who had dismantled the car and was in the process of putt...