Boris Johnson is beginning his first working day in self-isolation in Downing Street after meeting an MP who later tested positive for Covid-19.
The prime minister said he was “pinged” by NHS Test and Trace on Sunday and told to self-isolate, but remains well.
In a video on Monday, he urged others to “follow the rules” and self-isolate if contacted by the scheme.
On Thursday Mr Johnson spent about 35 minutes with Tory MP Lee Anderson, who lost his sense of taste the next day.
It comes as the government prepares a policy relaunch after fierce internal rows and departures from No 10.
Downing Street said a series of “critical announcements” would this week detail Mr Johnson’s “ambitions for the United Kingdom”.
They follow the dramatic departure of the PM’s chief adviser Dominic Cummings last week.