30 years ago today, on 13th March 1996, I was sixteen and at high school. It was a Wednesday. Half an hour up the road in Dunblane, a man called Thomas Hamilton walked into a primary school gymnasium with 4 legally-owned handguns and 743 rounds. He killed 16 children aged between 5 and 6, the age my son is right now. He also killed a teacher, and injured 15 others, then killed himself. It was and is the deadliest mass (4+ casualties) shooting in UK history.