“Andrew, unfortunately, exhibited classic symptoms of what is scientifically recognised as the Dunning-Kruger effect, the cognitive bias in which people come to believe that they are smarter and more capable than they really are. The combination of minimal self-awareness and dim wattage leads sufferers of this condition to overestimate their own capabilities. Years of enjoying unearned obeisance to his royal position allowed Andrew to bang on with a combination of overweening self-confidence and unchallenged ignorance. It also made him an easy mark for con men and crooks.”