Michael Portillo returns with an authored documentary, that uses British state papers to shed fresh light on key events and personalities during the Civil War period in Ireland.

Partition, 1921, tells the story of how Ireland came to be to be partitioned from the perspective of the British and unionist politicians who divided Ireland. Michael Portillo examines how this happened, unravelling a web of intrigue woven by the British ruling classes for whom the essential issue was defending Ulster