I cannot think of any circumstances in which a government can go to war without the support of parliament.

I think most people who have dealt with me think I'm a pretty straight sort of guy, and I am.

Where radical Islamism is going to be a factor, it's going to be very, very tough.

A simple way to take measure of a country is to look at how many want in.. And how many want out.

Climate change is probably the greatest long-term challenge facing the human race.

We need to develop the new green industrial revolution that develops the new technologies that can confront and overcome the challenge of climate change; and that above all can show us not that we can avoid changing our behaviour but we can change it in a way that is environmentally sustainable.

Our ultimate weapon is not our guns but our beliefs ... Ours are not Western values. They are the universal values of the human spirit and anywhere, any time, ordinary people are given the chance to choose, the choice is the same. Freedom not tyranny. Democracy not dictatorship. The rule of law not the rule of the secret police. The spread of freedom is the best security for the free. It is our last line of defence and our first line of attack.