On December 16th 1998 a McLaren F1, driven by Peter Taylor, an independent test and development engineer broke the MIRA high-speed circuit record averaging 168 mph (270.36 km/h) round our 2.82 mile (4.53 km) banked circuit at one point reaching a speed of 196.2 mph (315.75 km/h).
The previous lap record was set in April 1967, admittedly in a sports-racing prototype built with the express purpose of winning the Le Mans 24-hour endurance race; Jaguar's XJ13 which managed an impressive lap average of 161.655mph (260.15 km/h). The XJ13 was driven by British racing driver David Hobbs.