Sabine Schmitz is preparing to make her Silverstone Classic (26-28 July) debut racing a 220mph Porsche 962 in one of the massive event’s thrilling races for Group C prototypes. The 44-year-old German first came to fame as the ‘fastest taxi driver in the world’, a title she gained for driving passengers around the full 12.9-mile Nürburgring Nordschleife circuit at very high speeds.