UK Prime Minister Boris Johnson
UK Prime Minister Boris Johnson

The UK government is considering a delay to all lockdown restrictions of up to four weeks from the scheduled June 21 end, amid a continuing rise in cases of the Delta variant of COVID-19, according to a media report on Saturday.

It comes as the country reported 8,125 new COVID-19 cases in a 24-hour period, another record daily high since the end of February, and Public Health England (PHE) found that infections from the Delta variant - the B1.617.2 variant of concern (VOC) first identified in India - rose by nearly 30,000 in a week to hit 42,323.

Downing Street sources told the BBC that no final decision has been made yet and that several options are being evaluated as the latest data is studied before UK Prime Minister Boris Johnson makes a scheduled announcement regarding lockdown on Monday.

Asked about Monday's announcement in Cornwall on the sidelines of the G7 Summit, Johnson told the BBC it was important to ensure any easing of restrictions was "irreversible".

"What I can certainly say is we are looking at the data, continuing to do that, but what you can certainly take is. the roadmap was always cautious but irreversible, and in order to have an irreversible roadmap, we've got to be cautious," said Johnson.

"Again you have hospitalizations up, you've got cases up. There are grounds for caution. That doesn't mean that this country hasn't made enormous progress with vaccination. Clearly what we have is a race between the vaccines and the virus - and the vaccines are going to win. So it's just a question of the pace," he said.

The British Medical Association (BMA) is among some of the leading public healthcare groups and officials calling for a delay to the planned easing of all lockdown restrictions on June 21, dubbed "Freedom Day" as it would see all legal limits on social contact removed. Pushing the date back by a few weeks is intended to allow the country's vaccination programme to take greater effect, as the rollout moves through to younger age groups and the older age groups get covered with their second jabs.

"It's not just about the number of hospitalisations, but also the risk to the health of large numbers of younger people, who can suffer long-term symptoms," said BMA council chairman Dr Chaand Nagpaul.

The June 21 date was set as the earliest point at which an end to all lockdown measures would be considered as part of a roadmap laid out by Boris Johnson earlier this year. It is tied to several criteria being met, including the vaccine rollout continues successfully; evidence shows vaccines effectively reduce hospitalisations and deaths in those vaccinated; infection rates do not risk a surge in hospitalisations which would put unsustainable pressure on the NHS; and the assessment of risks is not fundamentally changed by new VOCs.

Of these four criteria, the one related to VOCs is the one tripping up the schedule as PHE's latest analysis this week found that the Delta VOC was about 60 per cent more transmissible than the Alpha VOC identified in the UK and also reduces the effectiveness of vaccines to some extent.

In details released on Friday, health officials said there is also analysis supporting a reduction in vaccine effectiveness for Delta compared to Alpha. However, the analysis continues to show that vaccine effectiveness against the Delta VOC is higher after two doses. With an estimated two-thirds of people infected with the Delta variant not having had a single dose of a Covid vaccine, officials continue to stress the importance of taking up the vaccine to ensure protection against the VOC.

"We don't want to squander those hard-fought gains that we have made through the vaccination programme," said UK Vaccines Minister Nadhim Zahawi, in reference to the lockdown plans.

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