What makes a great screenplay? Structure? Dialogue? Can it take us places a novel can’t reach? Francine Stock of The Film Programme, Tim Robey, The Telegraph film critic, Oscar-winning (Gladiator) playwright of Mandela, Shadowlands and Les Miserables, Bill Nicholson and the legendary director and screenwriter of Withnail and I, Jennifer 8 and The Rum Diaries debate the strengths of their favourite film scripts and recommend a top ten screenplays of all time list. To join the conversation and make your own arguments for favourite movie scripts, please post on Hay Festival’s Facebook page or Twitter @hayfestival #nobodysperfect.