Sir David Jason has lamented he is no longer fit to fly - and has been forced to surrender his pilot licence. The 84-year-old comedy legend used to enjoy flying a Robinson R44 helicopter but has been forced to give up the keys to his personal flying device. Sir David - famous to millions for his iconic TV roles including Derek 'Del Boy' Trotter in Only Fools and Horses and DI Jack Frost in A Touch of Frost - got his license in 2005. But due to a string of health issues, the star has now had to