Mr Johnson has tested positive for coronavirus, Downing Street says.

His symptoms are mild and he will continue to lead the government response to the virus while he self-isolates, a spokesman says.

Johnson says he will continue to lead the nation from home.

“I’ve developed mild symptoms of the coronavirus, that’s a temperature and a persistent cough,” Mr Johnson said in a video posted on his Twitter account.

“On the advice of the chief medical officer, I have taken a test and that has come out positive.

“I’m working from home and self-isolating. That’s entirely the right thing to do.

“I can continue, thanks to the wizardry of technology, to communicate with my top team and lead the national fightback against the virus.”