If you asked a group of people whether making wearing front seat belts in cars compulsory helped save lives, many would answer in the affirmative. Ask how they know the answer, and many will say some variant of obvs innit: it’s obvious, it stands to reason, it’s common sense. The law, when it came in, in January 1983, was hugely controversial, but the controversy wasn’t about effectiveness, it was about liberty. It was the first time the government had passed a law that sooner or later would affect just about everyone, requiring them to do something not to protect others, but to protect themselves. Since we were at the time, and still are for matter, free to drink ourselves to death, or smoke ourselves to death, it was argued we should also be free to smash ourselves to death. The state had no business interfering in personal decisions; doing so marked the beginning of the nanny state, from which there would be no turning back. Promoters of the law claimed that up to a thousand lives be saved every year, and there would be important secondary benefits, including reduced demand on the NHS.