Randomised tests. They wont test the whole population. They'll do a sample and from that make a prediction. I'll go back and watch the episode on the I player again and get some more detailsSurely those are just known (i.e. positively tested) infections, there will be many more that are asymptomatic and untested.
Edit: There's a link here: https://www.ons.gov.uk/peoplepopula...aviruscovid19infectionsurvey/england10may2020
The link states that it's between 76,000 to 225,000 with the 136,000 as the most likely estimate.
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