Dominic Cummings has been challenged by a former top prosecutor to provide evidence about his movements during the coronavirus lockdown.
The Mirror revealed in May how the Prime Minister's chief aide drove from London to Durham despite having Covid-19 symptoms.
Durham Constabulary said Mr Cummings "might" have broken lockdown rules, following revelations of his journey, and a separate 60-mile round trip to a local beauty spot.
He explained the trips by saying he and his wife Mary self-isolated at his family's farm in Co Durham because they were worried about childcare for their four-year-old son.
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