One of the things we have learned during this pandemic is that reputable sources are capable of publishing false information. So we can’t just take their assert

One of the things we have learned during this pandemic is that reputable sources are capable of publishing false information. So we can’t just take their assertions as facts. We have to ask them to explain how they arrived at them. The claim that one in 6 Londoners have had the virus is particularly suspicious because Sweden made similar claims about infections in Stockholm based on rough estimates and they turned out to be wrong when actual studies were carried out.