Helen Lewis meets the distinguished economist Robert Skidelsky, who's been asked by the Shadow Chancellor to lead an inquiry into a four-day working week. Lord Skidelsky is a biographer of John Maynard Keynes, who predicted we'd be working 15 hours a week by 2030. So what has happened to the Keynesian dream? And, as he approaches his 80th birthday, why is Lord Skidelsky still working so hard?

Producer: Chris Ledgard