Her parents clearly did not regard themselves as keepers of the Chaplin flame, although it would have been more understandable if they had. The working-class Londoner was famous for being the Tramp, but his global influence - as writer, producer, director and, most of all, actor - was colossal. He revolutionised the film industry, cofounded United Artists with Mary Pickford and Douglas Fairbanks, and was hailed by George Bernard Shaw as a genius. In 1999, 22 years after his death, the American Film Institute ranked him as one of the ten greatest male actors of all time. He left a large fortune, divided up between his huge family (he had 11 children, although two died before he did). 'There's a photo on the stairs of him looking at some film,' says Oona vaguely. 'And people think it's awfully original to give my parents statuettes of him, but most of those get passed on pretty quickly.'