PRINCE William, the second-in-line to the British throne, has taken a summer holiday without his girlfriend Kate Middleton, but an old chum has accompanied him on the break. William, a flight lieutenant with the Royal Air Force, was on a summer break in Cornwall, where Lady Natasha Rufus Isaacs was often to be seen by his side, the Sunday Telegraph said. Williams younger brother Prince Harry was also among the guests taking a five-day break at a house rented by the father of Lady Natasha, who refused to comment on the issue. I dont want to talk about the holiday. It was a private occasion, the 26-year-old daughter of the Marquess of Reading was quoted as saying. Meanwhile, Kate Middleton was away working at her parents mail order business in Berkshire. PTI