Fault in NHS Covid app meant thousands at risk did not quarantine

Error meant users spent much longer next to infectious person before self-isolatingCoronavirus – latest updatesSee all our coronavirus coverageA code error in the NHS Covid-19 app meant users had to be next to a highly infectious patient for five times as long as the NHS had decided was risky before being instructed to self-isolate, the Guardian has learned.New national restrictions are due to come into effect in England on Thursday, after MPs vote on them, and remain in place at least unt