In that race at Brands Hatch, Pryce took an unfancied Royale RP11 to first place in the Formula Three support race for the 1972 Formula One Race of Champions against many established Formula Three drivers such as Roger Williamson, Jochen Mass and James Hunt. So large was Pryce's advantage at the end of the race, many of the other teams voiced an opinion that Pryce's car had run the race underweight; it turned out that the circuit's weighbridge certificate had expired and everyone's cars had been underweight. Pryce retired from the leading group in the following two rounds at Oulton Park and Zandvoort, and then during practice for the support race of the 1972 Monaco Grand Prix his car came to a stop at "Casino Square" after a wire had come loose. He had exited his car to correct the problem when Peter Lamplough lost control of his car and struck the Royale RP11. Pryce was knocked into a shop window and broke a leg.