Six cases of the new COVID-19 Omicron variant have been identified in Scotland on Monday, taking the UK's total to nine following three cases detected in England earlier.
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.
The UK Health Security Agency (UKHSA) analysis showed that around three months after the third jab, protection against hospitalisation among those aged 65 and over remains at about 90 per cent.
The UK government has ordered 100 million doses of the Oxford vaccine once it is ready for rollout and the doses are being manufactured before it has been shown to be successful in order to save time once it clears all the regulatory stages.
The UK's medicines regulator on Friday approved the Pfizer/BioNTech coronavirus vaccine for 12 to 15 year olds.
As many as 721,469 appointments were made through the national booking service on Friday -- the day of the announcement -- at an average of more than eight every second. To cope with demand, the NHS said it is using stadiums and football grounds as giant vaccination centres.
Addressing a virtual Downing Street press conference, Boris Johnson acknowledged the divided views on lifting all lockdown restrictions to declare that his update does not imply that the pandemic "is over".
Frontline healthcare staff, people over the age of 80 and care home workers will be among the first to get the vaccine as part of Phase 1 of the programme from Tuesday, which was approved for rollout by the UK's independent regulator earlier this week.
Hari Shukla from Tyne and Wear said he feels it is his duty to receive his first of the two-dose vaccine, a moment UK Prime Minister Boris Johnson hailed as a "huge step forward" as Tuesday was dubbed "V-Day" or Vaccine Day in the UK.
The United Kingdom on Wednesday became the first country to approve the Pfizer/BioNTech vaccine against COVID-19, paving the way for mass vaccinations against the deadly novel coronavirus.
Maggie is among the first set of people contacted in advance by the NHS for the jab based on a pre-determined health risk criteria and will include 87-year-old British Indian grandfather of nine Hari Shukla, who will get his first dose at a hospital in Newcastle.