Kirsty Young's castaway is the creator of Downton Abbey, Julian Fellowes. He won an Oscar for his screenplay for Gosford Park and went on to write other feature films including The Young Victoria and Vanity Fair. Downton Abbey, which he created and writes, has been an enormous TV success with a huge audience. "Of course" he says, "if I had a clear understanding of why it had done so well, I would continue to write shows that attracted record viewers for the rest of my life." Producer: Leanne Buckle.