More than 44 million people in SLOTXO the UK have received at least one dose of a coronavirus vaccine - part of the biggest inoculation programme the country has ever launched.
With the aim of offering vaccines to all adults by mid-July, the government says the continued success of the vaccine programme is crucial to further easing of restrictions.
The rollout has expanded after the UK government hit its target of offering a first jab to everyone in the top priority groups - all those over the age of 50, plus those in high-risk categories by mid-April. These groups account for 99% of coronavirus deaths so far.
The government plans to vaccinate all over-18s with a first dose and two-thirds of adults with a second dose by 19 July.
A decision to vaccinate all 12 to 17-year-old children is unlikely to be recommended by UK vaccine experts imminently, the BBC has been told.
So far, almost 44 million people have had a first vaccine dose - more than 80% of the adult population - and 32 million have had a second.
The number of first doses administered each day is now averaging about 190,000 - far below an average of about 500,000 in mid-March, but is on the rise again as vaccines are rolled out to younger age groups.
An average of about 160,000 second doses are now being given a day, with the delivery of second doses accelerated in response to the emergence of the Delta variant, first identified in India.