What can we learn from nations that got it right? Victoria Allen analyses UK's Covid testing farce

Why has Test and Trace fallen apart in England while other countries have managed to make the system work? The principle is simple – test people with symptoms, trace their contacts and ask them to self-isolate – but the execution has varied dramatically. England has lagged behind countries such as South Korea, which rapidly grasped the importance of testing people and tracking their contacts. And where Germany invested in local contact tracers, the English system relied on poorly performing call centres.