The UK will offer a first dose of a coronavirus vaccine to all adults by early June, reports claim.
Vaccination teams are reportedly on track to offer every adult at least one jab by June 10.
Boris Johnson has vowed to vaccinate every adult in the UK by the end of July.
But that target could be beaten weeks in advance if the current pace of the rollout continues, according to The Times.
The timeline has reportedly been forecast by research company Airfinity which calculated that the speed of the rollout will save the UK billions of pounds.
A separate estimate in The Telegraph suggested every over-40 in the UK could be vaccinated by Easter.
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The newspaper reports that all over-50s can expect an invitation for a jab next week.
A boost to the UK's vaccine supplies should leave the NHS stocked up enough to finish off the rest of the over-40s by April 4, according to the report.
It comes on the back of reports a surge of 10 million extra doses could become available and see over-30s getting first jabs earlier than expected.
From next week a big boost in supply will see a "rapid increase" in the number of people getting vaccinated after a "dip" at the end of February, Vaccines Minister Nadhim Zahawi said this week.
The Government hopes to end restrictions by June 21.
It will review restrictions toward the end of the month, with success in part relying on the arrival of new jab supplies from Moderna, Janssen and Novovax in time for the summer.
If key tests including a satisfactory level of nationwide immunity to coronavirus are met, society could fully reopen from July, according to the government's best case scenario plan.
However the emergence of mutant variants of the virus have threatened those hopes in recent months.
Various strains are being monitored as experts and drugmakers monitor each new variant's responsiveness to jabs currently in use, including the Pfizer and Oxford AstraZeneca shots.
And the Prime Minister has admitted the reopening of schools in England on Monday could cause a fresh spike in infection rates.
But the transmission rate continues to go down, and daily death and case numbers are falling.
The UK's 'R' rate has dropped to between 0.6 and 0.8, down from 0.7-0.9 a week ago.
Friday's daily death toll recorded a drop of 76% in a month.
A total 175 new Covid deaths were reported along with 6,609 new cases.
The UK had given a first dose of the vaccine to more than 23million people by Friday.
Health Secretary Matt Hancock has committed to a target of giving all over-50s getting at least one dose by April 15 and the country's entire adult population getting a first dose by July 31.
