Leigh Chambers’ guest is David Reynolds talking about his book, Island Stories, which investigates how Britain’s sense of national identity has been shaped, and how that has brought us to Brexit. Simon Parkin discusses his book A Game of Birds and Wolves in which he reveals how a secret war game played helped Britain win the Battle of the Atlantic. And Isabella Tree talks about Wilding, her account of what happened when she and her husband allowed their land to return to the wild.