More than six million at-risk people or over-65s who are yet to get their autumn booster will be reminded to book a jab this week as the weather dramatically declines ahead of winter.
The vaccination programme has already delivered over 5.5 million autumn top-ups to combat Covid-19 since its launch last month.
Around 6.6 million people are most vulnerable to serious illness from Covid due to number of factors, including being aged over 65, having suppressed immune systems, being pregnant, having a learning disability or another health issue.