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It’s just over a year since the businesswoman and conservative peer Dido Harding was brought in to set up a test and trace system to help stop the Covid-19 pandemic. The system was going to be 'world-beating' and help get the UK out of lockdown according to the Prime minister but the incredible costs involved – around £37 billion – have been criticised for failing to make an impact. The system has improved but what will its legacy be? Dido Harding talks to Emma Barnett and reflects on the ups and downs of the last year.