Mark Lawson interviews Ian McEwan, as he publishes a new novel Sweet Tooth, in an edition recorded before an audience at the Edinburgh Festival. Ian McEwan reveals the inspiration for Sweet Tooth, which is set in the early 1970s, and brings together the worlds of British espionage and literary ambition. He also discusses how he has plagiarised himself, considers the role his family background has played in his life and work, and reflects on whether he would ever write a memoir. Producer Ella-mai Robey.