More than 15 million people in the UK have now had their first coronavirus vaccine, in what Boris Johnson described as a "significant milestone".
The PM hailed the "extraordinary feat", reached just over two months after the first jab was given on 8 December.
It comes as the government is expected to announce on Monday it has met its pledge to offer a jab to everyone in the top four priority groups in the UK.
The rollout is now being expanded to over-65s and the clinically vulnerable.
In a video, Mr Johnson praised a "truly national, UK-wide effort", adding that in England the jab had been offered to all those in the top four priority groups.
Wales has also met the target.
But "no-one is resting on their laurels," Mr Johnson said. "We've still got a long way to go to. And there will undoubtedly be bumps in the road. But after all we've achieved, I know we can go forward with great confidence."
Sunday's daily coronavirus figures show 15,062,189 people have now received an initial vaccine dose - after 505,362 first jabs were given out on Saturday.
A further 258 people in the UK have died within 28 days of a positive Covid test, taking the death toll by that measure to 117,166. Fewer deaths tend to be reported on Sundays, due to a reporting lag over the weekend.
There were 10,972 new cases reported, bringing the total number of recorded infections to 4,038,078.
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