The Iraq Survey Group has already found massive evidence of a huge system of clandestine laboratories.

If you are trying to take a difficult decision and you're weighing up the pros and cons, you have frank conversations. Everybody knows this in their walk of life.

If we take all this actions and if it turns out not be true, we have reduced pollution and have better ways to live, the downside is very small. The other way around, and we don’t act, and it turns out to be true, then we have betrayed future generations and we don’t have the right to do that.

My view always is that we should learn the lessons, both of the last sort of 50 years of policy-making and it is possible to get to a foreign policy that is engaged and active without going back to where we were in the post-9/11 world.

There are big questions about the sort of skills you need in modern government today. You put politicians in charge of billions of dollars with absolutely no training and very little support system around them. It's an extraordinary thing.

They could have been removed. They could have been hidden. They could have been destroyed.

It's not that tens of millions of people all want to be violent. But they share the worldview that then, at its extreme, gives rise to the violence. And in my view, this is why this is such a global problem.