The Chilcot report is damning. It exposes a litany of failures over a long period, including reliance on flawed intelligence assessments, lack of planning and insufficient foresight of obvious consequences. But the report also exposes a chilling lack of rigour and a political culture of deference.

When I was director of public prosecutions, from 2008 to 2013, I had a first-rate counter-terrorism team, who worked closely with the police and the security and intelligence services to defeat and disrupt terrorism.

In my view, the military action taken in Iraq in 2003 was not lawful under international law because there was no U.N. resolution expressly authorising it.

The government must be open enough to provide robust impact assessments of leaving the single market or the customs union, including region-by-region and sector-by-sector analysis.