In this exclusive interview, I speak to Professor Sir David Omand, one of Britain’s most senior ex-intelligence officers. He was the first UK Security and Intelligence Coordinator, responsible to the Prime Minister for the professional health of the intelligence community, national counter-terrorism strategy and “homeland security”. He served for seven years on the Joint Intelligence Committee. He was Permanent Secretary of the Home Office from 1997 to 2000, and before that Director of GCHQ. We talk through the incredible tools In his new book How Spies Think: 10 Lessons in Intelligence and how the big decisions in our lives can be easier when using the frameworks used by British intelligence.