By RICHARD HARTLEY-PARKINSON Introducing your host: Charmian Griffiths shows clippings of Will and Kate as the bus sits in a car park opposite the Old Boot InnIt was supposed to be a one-off event, but the organisers of a tour of Kate Middleton country said it was so popular they wanted to keep on doing it and they are now taking bookings for more trips. In fact, they have even more than trebeled