The government hopes to offer every adult in England the chance to book a Covid booster before the end of 2021.

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Booster campaigns are being brought forward across the UK, in response to worries over the Omicron variant.

When can I have a booster?
In England a booster is available to every adult aged 18 or over from this week - as long as you had your second dose at least three months ago.

Over 30s can already book a booster online, from two months after their second dose. From Wednesday this will be extended to over 18s.

Beforehand, some walk-in appointments will be available - depending on where you live. The government says: "If there are long queues or all slots have been booked, people are encouraged to be patient and keep trying, or book online."

Scotland has also announced that it aims to offer boosters to all adults before the end of the year, again at least three months after a second dose. People aged 30-39 are now able to book their vaccination online. Appointments will be open to 18 to 29-year-olds later in the week.

Wales is also hoping to hit the same vaccination target. Walk-in and drive-through clinics are being used. People are asked to wait to be invited for their booster, and older and higher-risk people are being prioritised.

Northern Ireland's booster plan is being accelerated, with walk-in jabs available for over-30s.

Why do I need a booster?
The evidence so far suggests that Omicron may be more infectious than previous variants, and that existing vaccines may be less effective at stopping the Omicron variant

However, early studies suggest that an extra dose of vaccine - in other words, a booster - can prevent around 75% of people getting any Covid symptoms.

The World Health Organization (WHO) says that existing vaccines should still protect people who contract Omicron from severe illness.