James Naughtie and readers quiz Nicholas Shakespeare about his book, Six Minutes In May: How Churchill Unexpectedly Became Prime Minister. It chronicles the dramatic political and military events of 1940 which led to the momentous Norway Debate and Chamberlain’s resignation.

Upcoming recordings at BBC Broadcasting House in London:

Wednesday 15 May at 1300: Lucy Caldwell on These Days

Thursday 6 June at 1245: Marlon James on A Brief History of Seven Killings