“Plan B” coronavirus restrictions must be enforced immediately to prevent the UK “stumbling to a winter crisis”, an NHS leader has warned.

NHS Confederation chief executive Matthew Taylor has urged the government to bring back certain measures, including mandatory face coverings in public places.

His remarks came as the UK recorded 223 COVID-related deaths on Tuesday – the highest number of daily fatalities since 9 March.

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A further 43,738 coronavirus cases were also reported in the latest 24-hour period, and on Monday, the UK saw the highest number of new infections since mid-July.

Although Downing Street has said it is keeping a “very close eye” on rising case rates, a spokesperson warned the prime minister has “absolutely no plan to introduce Plan B”.

If this strategy was enforced, people could be asked to work from home again and vaccine certificates would be required for nightclubs, while large indoor and outdoor venues could be forced to close.

Last month, Health Secretary Sajid Javid also confirmed that lockdowns would be considered as a “last resort” if this plan did not work.

COVID-19: UK reports highest daily number of deaths since March as a further 43,738 cases recorded

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Mr Taylor said the NHS is now preparing for what could be “the most challenging winter on record”, and encouraged Britons to support the health service by “behaving in ways that will keep themselves and others safe”.

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Warning that the nation’s recovery from the pandemic could be put at risk if pre-emptive action is not taken, he added: “The government should not wait for COVID infections to rocket and for NHS pressures to be sky high before the panic alarm is sounded.”

Boris Johnson’s official spokesman has previously said that Plan B would only be activated if there was a “significant risk of the NHS being overwhelmed”.

But No 10 says that the UK is not at this point, and the vaccine rollout means “the levels we are seeing in both patients admitted to hospital and deaths are far lower than what we saw in previous peaks”.

Professor Neil Ferguson – a leading member of the Scientific Advisory Group for Emergencies – said yesterday that he thinks Plan B could be implemented in England this winter, but a return to the type of lockdown seen back in January is unlikely.

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The UK now has one of the highest weekly rates of new reported cases in the world, and vaccination rates have fallen behind other European countries.

Data shows that approximately 67% of the population has received two doses of a COVID-19 jab, compared with 75% in Denmark, 79% in Spain and 86% in Portugal.

While the weekly rate of new reported cases stands at 24 per 100,000 people in Spain and 48 per 100,000 people in France, this figure currently stands at 463 per 100,000 people in the UK.

In other developments, the government has said it is also keeping a “close eye” on a new mutation of the Delta variant, which has been called AY.4.2 by scientists.

The UK Health Security Agency warned this variant is now making up 6% of new cases and could be up to 10% more transmissible.

Adam Finn, a professor of paediatrics at the University of Bristol and a member of the Joint Committee on Vaccination and Immunisation (JCVI), says the “very rapid rise” in the number of cases in the UK is a “reflection of how people are behaving”.

He told Sky News “nobody” appears to be wearing masks inside anymore, adding he doubts people are doing lateral flow tests.

Professor Finn said: “There’s a general sense that life’s gone back to normal and as a result the infection is being passed around.”

He added that unless there is a “clear message put out that we’ve got more infection going on now than at any point in the pandemic”, despite fewer hospitalisations, people are “not really going to take precaution”.

Meanwhile, Health Secretary Sajid Javid said that the government is “ramping up” its vaccination programme in a bid to encourage eligible children to get jabbed.

He added children aged between 12 and 15 would be able to use the national booking service to secure their COVID-19 vaccines “to make the most of half-term next week”.

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