There are around 7.5 million people aged 30 to 39, and 3.5 million of those are eligible for boosters from Monday, NHS England said.
British Prime Minister Boris Johnson on Wednesday announced his government's decision to lift all the additional restrictions imposed to contain the spread of Omicron, including the mandatory wearing of face masks anywhere, from next Thursday after analysis showed that the new variant of Covid-19 has now most likely peaked in the country.
The Department of Health and Social Care said a total of 81,959,398 doses of COVID vaccines have been administered in the UK, with 46,227,101 people receiving a first dose (87.8 per cent) and 35,732,297 people receiving both doses (67.8 per cent).
The UK will now be taking forward a solution that brings together the work on the National Health Service app and the Google/Apple solution.
To enable large-scale vaccine studies to take place across the UK, the aim is to get 500,000 people signed up by October, which is considered vital in the fight against coronavirus.