I am trying to picture what it is like to be in a pit stop during a Formula One race, but I can’t get Bernie Ecclestone out of my head. All I can see is the octogenarian F1 supremo drunk on the fumes of burnt rubber and gasoline, grinning at the ear-shattering roar. Try as I might, I cannot connect this high-octane world with the man in front of me. At 36, David Clark is everything Ecclestone is not, yet for five years this shy, self-effacing Scot worked for the Williams Formula One team, ending up in charge of pit stop strategy. With a first-class engineering degree from Cambridge, he was hired to develop a GPS system for the 1998 Melbourne Grand Prix. Not, he adds, because drivers needed sat-nav to tell them where to go, but so they could use optimum driving lines.