(Photograph) - Platform change: rail union leader Jimmy Knapp, centre, addressed 150 A-level students from Charterhouse School, Surrey, last week. He was joined by Government rail regulator John Swift, left, on a panel organised for the Charterhouse Challenge of Management conference. Pupils at the Pounds 3,900-a-term school were divided into teams to advise Virgin boss Richard Branson on railway privatisation bids.