That includes 13.3 million people aged 40 and over – 47% of the age group.
In total, 29.4 million people had received at least one dose of a vaccine by the same date, covering 65% of people over 16.
Despite the success of the rollout, some staff at care homes in Reading have not been vaccinated.
The figures show 523 out of 706 eligible staff, including agency workers, at older adult care homes had received a first dose by May 9 – meaning 26% have not had a jab.
The government is currently in consultation over plans to make the jab mandatory for staff over concerns for residents.