Three years since the great American writer Joan Didion died, her publishers are putting a new work on the market. It’s called Notes to John, a diary of her time in therapy with her husband. Her fans will soon be queuing to buy, but the ethics of publishing such private material are being questioned. 

• GUEST: Andrew Biswell – the biographer of Anthony Burgess and now Professor of Modern Literature at Manchester University
• PRODUCER: Ali Benton