Anderson subsequently developed Kovar 19 symptoms and tested positive.

Johnson took to Twitter on Sunday to announce he had been contacted by NHS Test and Trace.

I have no symptoms, but I'm following the rules, he tweeted, adding that he would be working from home leading the government's pandemic response.

It's another major setback for Johnson following last week's resignation off Dominic Cummings, his chief adviser, and Lee Cain, his communications chief.

We can newspapers were full of reports, a better infighting at Downing Street, painting a picture of a government in chaos in an attempt to show he's still got a grip on things Johnson's office that he will make a string off announcements over the next two weeks on issues from the pandemic to green policy.

This is not Johnson's first brush with the disease.