This is much the clearest account I’ve read of the current risks in the spread of Covid-19. The thing I find particularly odd having recently endured Self-isolation myself is that you can only be tested if you have the symptoms already, whereas it seems obvious that the only way to identify the spread of contagion and prevent it is to test those who think they might have it and have had contact with someone who has, get the test and results really fast, without having to drive to John O’Groats, and then get those people to self-isolate, not have to wait until one already knows, and shows the symptoms, that one has it:-

https://www.theguardian.com/commentisfree/2020/sep/27/britain-failure-covid-surge-disaster-test-trace-virus?CMP=Share_AndroidApp_Other