At its introduction in 1982, the Sierra's revolutionary new shape proved a touch more divisive than Ford had anticipated, and some serious marketing became a priority, so it was the obvious choice to become the platform for Ford's new competition aspirations in conjunction with Cosworth.

It fitted the brief well as it was rear-wheel drive, had good aerodynamics, albeit being prone to lift at high speeds, and was available as a three-door.

The new body kit and rear spoiler would sort out the lift issues but, more importantly, Ford still needed to build 5,000 units for homologation, somewhat worrying when the company's initial approach to the dealer network came back with an estimate that suggested they could sell around 1,500 units! The eventual sales record is, of course, history.

Ford went on to sell 5,545 three-door cars including the RS500, of which only 500 were built, and the Cosworth engine also found its way into nearly 30,000 Ford Sierra Saloons (Cosworth three door, Sapphi...