On Start the Week Andrew Marr discusses the dying art of handwriting with the novelist Philip Hensher. As the typewriter has taken over from the pen, so email is killing off letter-writing, and Diana Athill celebrates the art of correspondence. But the poet Wendy Cope, who has just left thousands of emails to the British Library, welcomes the advent of digital communication, and the philosopher Nigel Warburton tweets, blogs and podcasts.