Boris Johnson is being kept in hospital for observation after the official description of his symptoms shifted from "mild" to "persistent".
The Prime Minister's spokesman today insisted he was in "good spirits" after a "comfortable night" in St Thomas' Hospital with a cough and fever from Covid-19.
He is still working - and has even taking the extraordinary step of working with physical documents from a red box at his hospital bed.
But his spokesman refused to confirm or deny reports he has received oxygen treatment after being taken to the London hospital for tests at 8pm last night.