AN MP said she is "so grateful" as she received her coronavirus vaccine this morning.

Brighton Pavilion MP Caroline Lucas shared a photo of herself getting the AstraZeneca vaccine at the Brighton Centre earlier today.

Writing on Twitter, she urged others to take the vaccine, when they are offered it.

She said: "So grateful to get my AstraZeneca vaccination from Brighton Centre today.

"Huge thanks to all the amazing staff and fab volunteers who make this happen every day - brilliantly efficient and so inspiring to see.

"When your time comes, do take it."

It comes as the UK reached a key milestone in vaccinating half of the adult population.

The Health Secretary Matt Hancock tweeted this morning: “Yesterday we vaccinated more people than any day yet.

"I’m delighted to be able to say that we’ve now vaccinated HALF of all adults in the UK.

“The vaccine is a national success story and our way out of this pandemic. When you get the call, get the jab.”

Speaking on Times Radio today, Professor Andrew Hayward, professor of infectious disease epidemiology at University College London (UCL) and a member of the Scientific Advisory Group for Emergencies (Sage) said a fourth wave of infections is still possible, if “mistakes” are made during the easing of lockdown measures, despite progress with the vaccine roll-out.

Prof Hayward said: “I think another wave is possible, likely even.

“I guess the difference is that another wave will cause substantially fewer deaths and hospitalisations because of high levels of vaccination across the sorts of people who would have ended up in hospital or unfortunately dying if they haven’t been vaccinated.

“So the consequences of another wave are less. I think the challenge is of course we don’t know exactly how much less.

“We know some people are still not vaccinated, because the uptake hasn’t been complete.

"We know the vaccine isn’t 100 per cent effective, although it’s very good.”

He said if there were further rounds of infections, a “very close eye” needed to be kept on who Covid-19 was infecting and whether they were in vulnerable age groups.