Harry, 37, and Meghan, 41, swapped the luxury SUVs favored by California celebrities and traveled by train on an Avanti service from Euston yesterday to the One Young World conference for young leaders from 190 countries. Meghan, wearing a £1,100 red Valentino top and matching £1,200 wide leg trousers, and her husband were greeted with cheers as they walked down an aisle through the £2,000 crowd to the stage at the event’s opening ceremony. After taking their seats with