For over 20 years Lara Maiklem has strolled the foreshore of London’s River Thames in search of treasures from the past. She joins us to discuss what she’s learned, as outlined in her new bestseller, ‘Mudlarking’. Plus: we meet immersive artists Jonah Freeman and Justin Lowe for a tour of their bold new exhibition in London, and author and journalist James Meek unpacks his latest book ‘To Calais, in Ordinary Time’.