The booster scheme, which was announced earlier this year, is set to start in September and should see 23million over-50s, vulnerable Britons and NHS and care home staff offered a third dose.

Extra vaccines would be rolled out in two stages — prioritising those most at risk of Covid, before the programme is extended.

While patients were initially expected to be offered the jab they were originally inoculated with, it is understood all patients will be offered the Pfizer jab as it has proven to be the most effective against the Delta variant.

The Department of Health has yet to confirm the official details of the booster scheme, plans of which were first shared by the Joint Committee on Vaccination and Immunisation (JCVI) in June.