Why did the US want regime change in Iraq? Was it really about the threat of terrorists getting hold of weapons of mass destruction after the September 11th 2001 attacks, or was the desire much deeper? And what was the British government's reaction?

This series was first broadcast in March 2023, to mark the 20th anniversary of the war in Iraq.

Why did the US and UK really go to war in Iraq? And what is the legacy? The BBC’s Security correspondent Gordon Corera speaks to those at the heart of the decision-making.