You can find some data below from the i’s Hugo Gye on the percentage of people by age group who have received their first and second dose of a Covid vaccine so far:

Several Greek islands, Malta and parts of the Caribbean could be added to the green travel list on Thursday, according to an industry expert.

Paul Charles, chief executive of travel consultancy The PC Agency, said a number of popular holiday destinations “really deserve” to be moved to the low-risk tier, which allows UK travellers to visit without self-isolation on their return home.

Mr Charles told the PA news agency on Wednesday that he expected additions to the list to include the Greek islands of Zante, Rhodes and Kos, the Caribbean islands of Grenada and Antigua, plus Malta and Finland.

He added that the addition of those locations to green status would be “a boost” to the struggling travel industry.

“We need to see the government widening the number of green destinations to help the sector recover and to help protect jobs and livelihoods, which the prime minister promised,” he said.

“It would be a boost to see those added. I still think we’re going to get the majority of European countries added at the end of June, but it would be an encouraging step forward.”

However, Mr Charles also warned that Malaysia, Thailand, Vietnam, Cambodia and Indonesia could be added to the red list, which means people returning to the UK are required to spend 11 nights in a quarantine hotel.

A further 12 people have died within 28 days of testing positive for Covid-19, according to government figures, as of Wednesday.

The new data means the UK’s official death toll now stands at 127,794 – although separate figures published by the Office for National Statistics show there have now been 153,000 deaths registered in the UK where Covid-19 was mentioned on the death certificate.

The government has also reported that there have been a further 4,330 lab-confirmed coronavirus cases in the UK, as of 9am on Wednesday.

Asked by PA news agency whether vaccine passport plans for mass gathering are being scrapped, health secretary Matt Hancock said: “One of the parts of step four is to set out four reviews, one of those is into certification.

“Being able to certify that you’ve had a vaccine is going to be necessary for international travel because some countries have already set out that they require proof that you’ve been vaccinated, and that means being able to prove with authority that you’ve had one of the jabs and confidence in which jab accepted for that proof – which is a matter for each individual country.

“We’ve provided the ability to show that through the NHS app, so we’re putting that certification in place where we know it will be needed.

“When it comes to using certification for domestic purposes, that is the review that Michael Gove is leading, and we’ll come forward with the conclusions of it soon.”

Matt Hancock has revealed the government has started commercial negotiations with AstraZeneca to secure a “variant vaccine” adapted to tackle the variant first identified in South Africa.

In a speech delivered at the Jenner Institute in Oxford, the health secretary said: “There is yet more to do, the work isn’t over yet – we’re still procuring all the time and planning what we need to keep this country safe, including new vaccines specifically targeted at variants of concern.

“I can tell you today that we’ve started commercial negotiations with AstraZeneca to secure a variant vaccine – future supplies of the Oxford /AstraZeneca vaccine that have been adapted to tackle the B.1.351 variant first identified in South Africa.

“Once again, we’re leading the way and backing projects with potential, so we can keep our vaccination programme one step ahead of the virus and protect the progress that we’ve all made.”

Matt Hancock has offered gloomy analysis of the prospect of easing of all remaining Covid restrictions in England on 21 June, suggesting there isn’t anything in the data to “say we are definitively off-track”

Speaking hours after Boris Johnson admitted the data was too “ambiguous” at the moment to make a decision on the final unlocking, the health secretary said the government would set out the next step by 14 June.

Our political correspondent Ashley Cowburn has more details:

Half a billion doses of the Oxford/AstraZeneca Covid-19 vaccine have been released for supply globally, according to Matt Hancock.

Speaking at the Jenner Institute in Oxford, the health secretary said: “The Oxford vaccine, developed by brilliant science here in Oxford, linked with AstraZeneca’s industrial might, backed by the support of the UK government, together, make it available at cost, this is in my view the greatest gift that this nation could give the world during this pandemic.

“A vaccine that’s available at cost – with no charge but intellectual property – and that because it can be stored simply offers hope for the developing world.

“So, as well as the money that we’ve donated – giving half a billion pounds to Covax (the global vaccine sharing facility) – we’ve also given the world the vaccine, which makes up 96% of those Covax doses.

“As of today, I can confirm that over half a billion doses of the Oxford AstraZeneca vaccine have now been released for supply globally, the majority of them in low and middle income countries.”

Boris Johnson said the government will have “no hesitation” in moving countries around the red, amber and green lists of travel restrictions.

Asked whether there may be more countries added to the green list soon, where there are no requirements to quarantine on returning to the UK, the prime minister said: “You’ve got to wait and see what the Joint Biosecurity Centre say and what the recommendations are about travel.

“We’re going to try … to allow people to travel, as I know that many people want to, but we’ve got to be cautious and we’ve got to continue to put countries on the red list, on the amber list, when that is necessary.

“I want you to know we will have no hesitation in moving countries from the green list to the amber list to the red list, if we have to do so. The priority is to continue the vaccine rollout, to protect the people of this country.”

Chris Hopson, chief executive of NHS Providers, described the latest milestones in the vaccination rollout as an “incredible achievement”, with three-quarters of adults in the UK having received a first dose and 50% of adults in England having been given both jabs.

He added: “We know vaccines are breaking the chain between infection rates, hospital admissions and death. But we also know two doses are better than one, particularly in our fight against the Delta (Indian) variant.

“So while there’s a lot to celebrate, we’ve still got a way to go before people have had both jabs. We also know it takes three weeks for doses to be fully effective.

“We urge everyone to get their jabs when they’re offered them.”

A new variant of coronavirus has been detected in Vietnam which appears to be a mutation of the Delta variant, previously known as the Indian variant.

Vietnamese authorities initially said it was a “hybrid” between the Delta variant and the Alpha variant, also known as the UK variant. However, this has been disputed by the World Health Organisation (WHO).

My colleague Liam James has more details: