Yes, I was right.The British Medical Journal published several articles on this, quoting percentile figures even higher than 50%. The most recent article I have read was published on 2nd September 2021.
I know at the Royal Derby hospital near me that several friends who work there had the 'finger prick' test and all but one of the four showed antibodies. They test for them fortnightly.
https://www.ons.gov.uk/peoplepopula...s/coronaviruscovid19latestinsights/antibodies
It took until March 2021 before 50% of people tested positive for antibodies. Yet again Gas is making stuff up.