Racing driver who won many endurance races, including the 24 Hours of Le Mans, but only one grand prix, at Barcelona in 1975The German racing driver Jochen Mass, who has died aged 78, won only one of the 104 grands prix in which he competed between 1974 and 1982, but he was known as a talented and reliable competitor, a useful number two to such champions as Emerson Fittipaldi and James Hunt, as well as being a winner of many endurance races in sports cars, including the 24 Hours of Le Mans.His