More than 10 million people in Britain have received the first dose of a Covid-19 vaccine, Health Secretary Matt Hancock said on Wednesday, describing the milestone as "hugely significant".
Britain is aiming to offer a shot to all over-70s, highly vulnerable people, and frontline medics and care workers by the middle of February.
The pace of vaccinations, which are running at 400 000 shots a day, puts Britain only behind Israel and the United Arab Emirates in the number of doses delivered per 100 people.
"This is a hugely significant milestone in our national effort against this virus," Hancock said on Twitter.
Government data showed 10 021 471 had received a first jab, while 498 962 had also received a second.
Britain was the first country to approve vaccines developed by Pfizer-BioNTech and Oxford University-AstraZeneca, enabling it to make an early start on roll-out.
It also struck supply deals with manufacturers early in the development of the vaccines, helping it avoid some of the supply shortages that are hampering European programmes.