In Smartville, they build more cars per person than even Nissan's UK plant in Sunderland - but the factory, close to the French and German border at Hambach, does not even figure in the league table for productivity. Currently rated at number one in the annual survey by the World Markets Research Centre's list of Europe's most productive car factories, Nissan makes 99 cars per employee a year. In Smartville, writes Chris Wright, they make 140 . . .