 He stayed in self-isolation with mild symptoms for seven days, before delivering an update on COVID-19 testing targets and on government plans to write off £13.4 billion of NHS debt.In April 2020, Hancock was heavily criticised when it emerged that the target he had set for 100,000 daily COVID-19 tests had been met only by changing the method of counting, to include up to 40,000 home test kits which had been sent, but not yet completed.This change was challenged by the UK Statistics Authority and labelled a "Potemkin testing regime".