Former Formula 1 and motorcycling world champion John Surtees has died at the age of 83. Surtees is the only man to have won the grand prix world championship on both two wheels and four. He won four 500cc motorcycling titles - in 1956, 1958, 1959 and 1960 - and the F1 crown with Ferrari in 1964. Surtees died at St George's Hospital, London, on Friday afternoon after being treated for an existing respiratory condition, a family statement said. "We deeply mourn the loss of such an incredible, kind and loving man as well as celebrate his amazing life," the...