The current land speed record holder, rather surprisingly, doesn’t wear number plates. Thrust SSC was powered by two Rolls-Royce Spey jet engines – as used in the RAF’s Phantom II fighter – and achieved 763mph in October 1997, and in so doing became the first car ever to break the sound barrier. That its record has stood for more than two and a half decades is proof of the technical complexity, cost and danger of these runs.