A Downing Street spokeswoman said: “On the advice of his doctor, the Prime Minister has tonight been admitted to hospital for tests.

“This is a precautionary step, as the Prime Minister continues to have persistent symptoms of coronavirus 10 days after testing positive for the virus.

“The Prime Minister thanks NHS staff for all of their incredible hard work and urges the public to continue to follow the Government’s advice to stay at home, protect the NHS and save lives.”

Johnson remains in charge of the government and in contact with ministers and officials.

Johnson on March 27 became the first leader of a major power to announce that he had tested positive. He has been isolating in his Downing Street flat since.