During pre-qualifying for the 1977 British Grand Prix Purley sustained multiple bone fractures after his car's throttle stuck open and he crashed into a wall. His deceleration from 108 mph (173 km/h) to 0 in a distance of 26 inches (66 cm) is one of the highest G-loads survived in a crash (180 G). He scored no championship points during his Formula One career. He died in a plane crash, having retired from motorsport and taken up aerobatics, in 1985.