Venue: The Bowling Green.

Ben Macintyre is the multimillion-copy bestselling author of books including Agent Zigzag and Operation Mincemeat, and is a columnist and Associate Editor at The Times. His latest book is SAS: Rogue Heroes, the first ever authorized history of the SAS.

Delving into the secret SAS archive Ben Macintyre tells the story of how, in the summer of 1941, at the height of the war in the Western Desert, a bored and eccentric young officer, David Stirling, had a vision for a new kind of war: attacking the enemy where they least expect it – from behind their own lines.

Despite the intense opposition of many in British High Command, Winston Churchill personally gave Stirling permission to recruit the toughest, brightest and most ruthless soldiers he could find. And so began the most celebrated and mysterious military organisation in the world: the SAS.

With unprecedented access to the SAS secret files, unseen footage and exclusive interviews with its founder members, Ben Macintyre tells the remarkable story behind an extraordinary fighting force, and the immense cost of making it a reality.