The NHS coronavirus vaccine booking system has opened to healthy people aged 42 and over.
The national booking system has been extended for the second time in two days to allow more healthy adults in their 40s to book their jab.
People in England who are aged 42 and over, or those who will turn 42 before July 1, can now arrange their vaccine appointment through the national booking website.
The system only opened to those aged 44 and over on Monday.
There had been supply constraints throughout April, with second vaccines for those at highest risk of Covid-19 being prioritised with the supply that was available.
But even amid supply issues, the NHS was able to extend the rollout of the vaccine programme to its second phase, healthy adults under the age of 50.
The first of this group to be offered the jab was those age 45-49.
Within a week of the booking system opening, two thirds of this group had received their first vaccine.
It comes after the Prime Minister warned the UK would probably be hit with another wave of Covid-19.