Testing tsar Dido Harding is self-isolating after getting 'pinged' by app 

(November 18 17:36) Dailymail.co.uk

Baroness Harding, who heads the NHS Test and Trace service, is self-isolating after receiving an alert from her service.

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Testing tsar Dido Harding is self-isolating after getting 'pinged' by app&nbsp;