Interview: Will Butler-Adams, CEO of Brompton Bikes

In an unprepossessing brick block, in an equally nondescript industrial estate on the West of London lies the factory and headquarters of Brompton Bicycles. It's tucked behind a Mercedes-Benz van depot, and I only know I'm in the right place because there are about five pretzel-shaped hunks of metal parked outside the door. Oh, and a bunch of twentysomething testers in slogan tees, bouncing around doing bunny hops and the like on recently finished Bromptons. It's like E.T., but without the...