I think what happened with 9/11 is that people sort of felt that it came from nowhere. Whereas I think now we understand the roots are very deep. I say it's like revolutionary Communism, something that is going to have to be knocked out over a very long period of time. This strain of extremism continues to be very strong, whether it's in Afghanistan, or Somalia or Yemen, or any of these places.

In no relationship at the top of any walk of life is it always easy, least of all in politics which matters so much and which is conducted in such a piercing spotlight.

But the world is ever more interdependent. Stock markets and economies rise and fall together. Confidence is the key to prosperity. Insecurity spreads like contagion. So people crave stability and order.

I'm an avowed centrist, and I believe that - centrism is often - it's almost the wrong word to use, because it's often seen as sort of splitting the difference between right and left.

If you don't see the Internet as an opportunity, it will become a threat. In two or three year's time, the Internet will become as commonplace in the office as the telephone.

Their barbarism will stand as their shame for all eternity.

I feel like everyone else in this country today. I am utterly devastated.