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
| Actor | Role |
|---|---|
 Michael PortilloPresenter | Presenter |
| GGerry AdamsSelf | Self |
| BBertie AhernSelf | Self |
| NNiamh GallagherSelf | Self |
| IIaim CarlisleSelf | Self |
| GGraham WalkerSelf | Self |
| MMargaret O'CallaghanSelf | Self |
| MMichael LaffanSelf | Self |
| CConor MulvaghSelf | Self |
 Jonathan PowellSelf | Self |