This will be around six weeks ahead of schedule and two months before the European Union, which aims to vaccinate all adults by the first week of August.
The forecast, published in The Times, assumes that nearly two million doses of the Oxford-AstraZeneca vaccine will be rolled out each week, along with 600,000 doses of the Pfizer-Biontech vaccine and 90,000 doses of the Moderna vaccine.
From April, the government will also start rolling out a million doses a week of the Novax jab and 254,000 from Janssen.
The new research will come as a boost for ministers who chose not to join the EU’s vaccine procurement scheme, which has been plagued by delays.
Dr Katharina Hauck, from Imperial College London, estimates that lockdown is costing the UK economy £18 billion a month.
It means that the vaccine programme, thought to cost around £12 billion, will pay for itself by the end of summer.
Four people from two households can meet up in a park or a garden. Restrictions on young people have also been eased, with four people aged between 12 and 17 able to meet even if they are all from different households.
Outdoor non-contact group sports for people aged over 12 have also resumed.
A new study has found that transmission of Covid-19 drops by at least 30 per cent after a person is vaccinated.
Public Health Scotland and the University of Glasgow assessed 300,000 NHS workers between December 8 – the first day of vaccination in Scotland – and March 3 to give the first direct knowledge of how the jabs impact transmission.
The study assessed the records of people who live with both vaccinated and unvaccinated health care workers, finding those with who had a single dose were at least 30 per cent less likely to pass the virus on.
Given that people living with healthcare workers could also catch the virus from other sources, the 30 per cent figure is a low estimate.
For those with both doses of the inoculation, they were at least 54 per cent less likely to pass on the virus.
The ability of vaccination to limit transmission has been suspected by experts, but never previously shown in a study.