It had been inspired by Daniel Kahneman’s book Thinking, Fast and Slow, a brilliant account, published in 2011, of the limits of human reason, and of the way in which we all suffer from what psychologists call ‘cognitive biases’. I found it consoling, when thinking about some of the mistakes I have made in my career, to learn that errors of judgement and the propensity to make mistakes are, so to speak, built in to the human brain. I felt that perhaps I could be forgiven for some of the mistakes I have made over the years.