Championed by a former chief medical officer, Lifeline is both a musical following Alexander Fleming's discovery of the first antibiotic and a warning about the threat of superbugs in the present day The floor of the United Nations is rarely handed over to musicians; when it is, it's to global superstars such as Abba, Beyoncé and K-pop band BTS. So why, then, has a foot-stomping, folk-infused Scottish musical been a…