In 1964 the Mary Poppins film premiered in Hollywood to world acclaim. But one person loathed it. She was PL Travers, the author of the books. To coincide with the release of Saving Mr Banks, this Culture Show special presented by Victoria Coren Mitchell explores the dark and complex life of the writer. Her twenty year battle with Walt Disney, the strange adoption of her child (he was one of twins) and how the film version overshadowed her writings but made her rich. With contributions from Emma Thompson, Cameron Mackintosh and PL Travers’s granddaughter.