My returning guest for this episode is David Hepworth - who joins me to discuss his new book 'Abbey Road - The Inside Story of the World's Most Famous Recording Studio'.

Many people will recognise the famous zebra crossing. Some visitors may have graffitied their name on its hallowed outer walls. Others might even have managed to penetrate the iron gates. But what draws in these thousands of fans here, year after year? What is it that really happens behind the doors of the most celebrated recording studio in the world?