The UK smashed its daily vaccine record for the third day running on what is being hailed as "Super Saturday".
A further 873,784 first and second doses have been given in the last 24 hours - equivalent to 1.3 per cent of the country's population being jabbed in a single day.
NHS staff administered almost 100,000 jabs in a single hour, vaccinating 27 people per second, between 11am and 12pm.
There were a record 756,873 vaccinations in England alone for the entire 24-hour period, including 686,424 first doses.
In the last seven days, the UK has vaccinated almost one million more people than it did the previous week for a total of 2,990,682.
The news was tweeted by Boris Johnson, who was among those vaccinated last week. The Prime Minister said: "Yesterday was a record-breaking day for the vaccine rollout, with 873,784 people receiving a jab.
"A huge thank you to everyone involved and please come forward to get your jab when you are invited to do so."
Health Secretary Matt Hancock weeted: “For the second day running, the team has reached a new RECORD number of vaccines administered in a single day – 873,784.
“This mammoth team effort shows the best of Britain – THANK YOU to the British public for coming forward.”
There were 96,221 second doses among the latest vaccines. A record 777,563 first doses were inoculated across England, Scotland, Wales and Northern Ireland.
The UK broke its record for the number of coronavirus doses given in figures released on Saturday, with 711,156 jabs taking the UK beyond the milestone of vaccinating more than half of all adults.
The surging numbers come with a bumper week of vaccines expected.
But the optimism is tempered by an expected break to UK supplies that will see first doses for the under-50s delayed, with only second doses administered predominantly in April.
In England, a total of 25,150,062 doses have been given to 23,559,503 people since the biggest NHS vaccination programme ever started just over 100 days ago.
NHS England data shows a total of 3,040,250 jabs were given to people in London between December 8 and March 20, including 2,830,964 first doses and 209,286 second doses.
This compares with 4,593,106 first doses and 266,422 second doses given to people in the Midlands, a total of 4,859,528. The breakdown for the other regions is:
– East of England: 2,802,771 first doses and 171,370 second doses, making 2,974,141 in total.
– North East and Yorkshire: 3,667,743 first and 285,797 second doses (3,953,540).
– North West: 3,008,425 first and 195,861 second doses (3,204,286).
– South East: 3,876,901 first and 268,798 second doses (4,145,699).
– South West: 2,675,817 first and 186,059 second doses (2,861,876).
NHS CEO Sir Simon Stevens said: “The speed and precision of the NHS vaccination campaign has been on full display this weekend, and yesterday NHS staff across England administered a remarkable 27 jabs a second.
"In just one day we vaccinated the equivalent of the entire adult populations of Liverpool, Southampton and Oxford combined.
“When my turn came earlier this week I was delighted to get my first dose, and we have a strong supply of vaccine for the coming week too, so if you are aged 50 plus, don't delay.
"Now is a great time to book your NHS Covid jab – it's quick and efficient, safe and effective, and painless."
Dr Emily Lawson, NHS England’s chief commercial officer and senior responsible officer for vaccine rollout, added: “It is remarkable that because of the sustained hard work of NHS staff and all those involved in delivering jabs up and down the country, the vaccination programme has once again topped its own success with its busiest week to date.
"I could not be more proud of all those involved who have helped us to achieve this latest milestone.
“This week we moved on to offering vaccines to those aged 50 and above, and we are making great progress so we urge anyone in this group to make use of the huge range of sites you can book in to across the country and get your jab.”
Vaccine supply issues could result in the UK’s vaccination programme being “delayed slightly”, a member of the Joint Committee on Vaccination and Immunisation has said.
However, Professor Jeremy Brown said due to the vaccination programme being “ahead of schedule” it will likely only fall back to the original timetable.
He told Sky News’ Sophy Ridge on Sunday programme: “It does look like we have been making a vaccine programme that is doing almost five million a week, which would be a fantastic result if we could maintain that.
“But it has always been the supply of vaccine that has been the concern that might delay things, and, yes, I suspect our vaccine programme will be delayed slightly compared to where we thought it might have been a few weeks ago.
“But then we are then ahead of schedule, so we are probably going to fall back to the original schedule and end up with everyone who is an adult being offered a vaccine by towards the middle to end of the summer.”
Despite the good news at home, a third Covid wave across Europe could leave Brits' summer holiday dreams in tatters yet again.
Trips abroad will be "extremely unlikely" this summer due to the risk of new variants being brought back into the UK, a top scientist advising the government has warned.
Dr Tildesley, a member of the Spi-M modelling group which advises the Government, told BBC Radio 4's Today programme: "I think that international travel this summer is, for the average holidaymaker, sadly I think, extremely unlikely.
"I think we are running a real risk if we do start to have lots of people going overseas in July and August because of the potential for bringing more of these new variants back into the country."
The EU has also been plagued by a slow vaccine rollout and several countries halted use of the Oxford/AstraZeneca jab amid blood clot fears, but have since reversed the decision after medicines regulators assured it's safe.
The UK's gradual reopening of society is hoped to gather pace in the coming weeks, after Boris Johnson's roadmap out of lockdown launched this month with the reopening of schools.
