A British driver who was the first person to break the sound barrier in a car on land has set a new speed record, this time in a hydrogen-powered vehicle. Twenty years ago, Green also set a world land speed record for a diesel vehicle in the JCB Dieselmax, attaining a speed of over 350mph (563km/h). The new record, set in JCB's Hydromax vehicle, surpassed the previous official hydrogen combustion title set in 2004 (185.5mph) by more than double the speed. "Setting a world land speed record with hydrogen power, 20 years after Dieselmax, is a huge privilege. Lord Anthony said: "Twenty years ago we came to Bonneville with JCB Dieselmax and showed what British engineering could do with diesel power.