The 1950 British Grand Prix was the first Formula One World Championship race. Britain has produced some of the greatest drivers in Formula One, including Stirling Moss, Jim Clark (twice F1 champion), Graham Hill (only driver to have won the Triple Crown), John Surtees (only world champion in two and four wheels), Jackie Stewart (three-time F1 champion), James Hunt, Nigel Mansell (only man to hold F1 and IndyCar titles at the same time), Jenson Button and Lewis Hamilton (seven-time champion). The British Grand Prix is held at Silverstone every July. Also, the United Kingdom is home to some of the most prestigious teams in Formula One, including McLaren and Williams. It is also home to the headquarters of six of the ten current F1 teams, including current champions Mercedes, four-time champions Red Bull Racing, Alpine and Aston Martin.