The PM was so late addressing the nation - originally announced for 4pm on Saturday afternoon - that Strictly Come Dancing was delayed by a few minutes before the BBC relegated Johnson to the BBC News channel.
Great British Bake Off host Matt responded by lampooning the PM (again) on Twitter.
“So, we are saying at 4 o’clock, we’ll have a 5:30 press conference, and this begins at 6:45,” he joked.
Fellow comedian Jason Manford also joked about the delayed press conference, quipping: “Where’s Boris? Finishing his subsidised 3 course meal in the House of Commons first I suspect! You’re welcome BJ!”
And Pointless host Richard Osman added: “Boris Johnson should do this press conference with the lights off and a torch under his chin.”
Other stars also weighed in...
The four-week lockdown will involve non-essential shops closing, restrictions on non-essential travel, and pubs and restaurants closing, except for takeaway services. The measures will be in place until at least December 2 in a bid to drive down spiralling rates of the virus.