The number of shots given is expected to top 4 million this week – nearly double what has been delivered per week recently, NHS sources say.
It would put the NHS rollout two weeks ahead of schedule and mean all over 50s will have been given at least one dose by the end of the month.
This increase has been made possible due to a large shipment of the Oxford-AstraZeneca vaccine from the Serum Institute in India, which has arrived and passed safety checks.
Vaccination teams are now working their way through the priority list of people in their 50s and younger adults with a disability.
Once this is completed, all nine of the priority groups in the first phase of the Government’s vaccination programme will have received a dose of the vaccine.
Germany, France, Spain and Italy paused injections of the vaccine amid concerns about blood clots in people who have had the shot, although the European Union’s medical regulator insisted its benefits outweighed the risk of side effects.
The EMA are expected to issue its decision on the continued use of the Oxford-AstraZeneca jab on Thursday.
Northern Ireland’s chief medical officer Dr Michael McBride also urged people to retain confidence in the jab as he received his first dose of the AstraZeneca version on Monday.
Dr Phil Bryan, vaccines safety lead at the Medicines and Healthcare products Regulatory Agency (MHRA), said people “should still go and get their Covid-19 vaccine when asked to do so.”