Seventy years after the Battle of Britain, the BBC has retraced the story of a little known amateur RAF squadron formed in a London gentlemen's club and composed of aristocrats and adventurers. But their privileged upbringing did not shield them from the brutal realities of war.

Read further

- BBC One's Dig 1940 traces the war from Dunkirk to the Battle of Britain and the Blitz on Wednesdays at 1930 GMT

- Watch colour footage of the 601 Millionaires' Squadron in episode 2 on 22 December