Prime Minister Boris Johnson remains in hospital for observations after being admitted on Sunday night with persistent coronavirus symptoms.
He was admitted to St Thomas's Hospital in London for tests ten days after he tested positive for COVID-19.
It is understood Mr Johnson had a “comfortable night” and is in “good spirits”, the Prime Minister’s official spokesman has said.
They say he is still in charge of government and continues to receive a red box with official papers.
Downing Street insisted Boris Johnson will follow doctors’ advice when pressed on whether it was safe for the Prime Minister to continue working while in hospital.
“The PM, as I said, will of course be guided by the advice of doctors,” his official spokesman said.
“The position is that the PM remains in charge of the Government.”
The PM tweeted an update on his condition at lunchtime on Monday. He wrote: "Last night, on the advice of my doctor, I went into hospital for some routine tests as I’m still experiencing coronavirus symptoms.
"I’m in good spirits and keeping in touch with my team, as we work together to fight this virus and keep everyone safe.
"I’d like to say thank you to all the brilliant NHS staff taking care of me and others in this difficult time. You are the best of Britain.
"Stay safe everyone, and please remember to stay at home to protect the NHS and save lives."
Following his admission to the hospital, 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."
