Outside St. Paul's the other day, a 'Robot Copper" was put on the street for an hour as an experiment. The machine was invented by a Norwegian and is a prototype model of fifty similar machines to be erected early next year on the pavements of Londons business centres. The Robot Coppers not only tell you by maps where to go and how to get there, but they also tell you all about what's going on and where to buy what you want. Daily Mirror columnist Noel Whitcomb is seen operating the machine. S