Thousands could have isolated for no reason due to Covid app error, says source
The disclosure means many thousands of people – those who had contact with symptomless people between five and three days before a positive test – were potentially asked to isolate unnecessarily. Photograph: Yui Mok/PA The Guardian By Rowena Mason and Mark Sweney Whitehall whistleblower says Matt Hancock was told of mistake where people were classed
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