Channel 4’s documentary seemed obsessed with trying to get the former prime minister to admit Iraq was a mistake, but John Rentoul , who has written a biography of Blair and who teaches a course about his government at King’s College London, senses a change in how he is remembered I n the early years of the course on the Blair Years that I have been teaching with Professor Jon Davis since 2008, students wanted to understand more about Tony Blair’s decision to join the American invasion of Iraq.