 Hello and welcome to Health Check from the BBC. I'm Claudia Hammond and every week on this show we look at what's happening in the world of health. And in the many years I've been presenting this programme, it is clear that some things definitely do get better in medicine, but then other things get worse. And today is no exception. In a moment we'll be hearing about the serious threat to health and to life caused by heatwaves and how more and more people are affected. But later on we'll hear about the injection, which could be a game-changer in