How do you adapt a novel?

We find out how our favourite books are adapted to both the small and silver screens, the stage and the radio. What makes a book adaptable: is it the characters or the plot? And how closely should you stick to the original? To help answer these questions Robert Bound is joined in the studio by writer Philip Meeks and page-to-screen consultant Sharmaine Lovegrove. Plus: comments from ‘High-Rise’ director Ben Wheatley and ‘One Day’ author and screenwriter David Nicholls.