More than 12 million people in the UK have now had at least one dose of a Covid vaccine, after 550,000 first jabs were given out on Saturday, APA reports citing BBC.
The government is aiming to offer first doses to 15 million people in the top four priority groups by 15 February.
At the current rate, about 16 million people would receive a first jab by that date.
The UK's daily Covid cases continue to fall, but remain high - with another 15,845 reported on Sunday.
Another 373 people in the UK have died within 28 days of a positive Covid test, the data also showed. Fewer deaths tend to be reported on Sundays, due to a reporting lag over the weekend.