For London's Cabbies, Job Entails World's Hardest Geography Test

Steve Scotland had better reason than most for thinking he knew London like the back of his hand. Not only was he a native Londoner, born and bred, but he'd spent years working as a chauffeur in the city, driving his passengers wherever they wanted to go, finding the shortcuts, negotiating the city's traffic-clogged streets swiftly, accurately, and with a minimum of fuss.