When it comes to UK aid, one area in particular has ennobled Britain and made the world a fairer, safer and more prosperous place: global health. On this day, World Health Day, there is no better time to celebrate, and also scrutinise, our legacy. Our record of saving lives in the world’s poorest countries is second to none. Working to boost global health systems around the world is the corner stone of international development, and the UK takes it very…