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Striker
Headlines from Boris's statement:
Boris Johnson says it would be "fatal" if progress on coronavirus vaccinations makes people complacent about the risk of infection.
Cancer treatments are being postponed because of cases being dealt with in hospitals, he adds.
With 1,280 deaths since yesterday, he reminds people that handling something touched by an infected person can catch the virus.
The PM says the closure of air travel corridors from 04:00 on Monday will apply across the UK.
This will initially happen for a month, although it will be kept under review and could be extended.
Anyone arriving in the UK must quarantine for 10 days or they have the choice of doing an extra test on day five to shorten the isolation.
Outlining the measures to come into place, he calls them "vital", as "day by day, hour by hour" progress is being made in vaccinating people.
He adds that 3.2 million people across the UK have received vaccines.
Prof Chris Whitty tells the press conference that the number of cases is still "extremely high".
"We are still at the place where just shy of one in 50 has Covid," he says. But the chief medical officer for England says there is some "levelling off" in the cases "thanks to enormous efforts by so many people" and because "virtually everyone" is adhering to the guidance.
"We were not sure this was going to be possible with the new variant," he adds.
They're shocking figures and have been over a 1,000 everyday for sometime now.