The over-30s are expected to be invited for their Covid jabs in the next fortnight after vaccinations roll out to the over-40s this week.
Half a million 44-year-olds will be told by text they can sign up from today, with the move to those aged 40 to 43 set out later in the week.
Talks continue over whether those in their 30s will receive the AstraZeneca jab, amid blood clot fears. The roll-out increases the chances of younger people qualifying for vaccine passports that could allow them to travel abroad this summer.
Over 33.5 million people have had their first dose – over 63.5% of UK adults. Some 12 million, or 22.8%, have had both jabs.