Boris Johnson is set to hold a press conference today following the national lockdown announcement.
The Prime Minister will hold a briefing alongside Chief Medical Officer Chris Whitty and Chief Scientific Adviser, Sir Patrick Vallance.
The briefing is expected to take place at 5pm and will be televised.
Yesterday Mr Johnson addressed the nation and announced a third national lockdown, with many businesses and schools forced to close until February half term at the earliest.
In his address, Mr Johnson warned the coming weeks will be the "hardest yet" but said that "with a fair wind in our sails" it should be possible to vaccinate 13 million of the most vulnerable people by mid-February, paving the way for controls to be eased.
But today Cabinet Minister Michael Gove suggested the lockdown could last until March.
Speaking to Sky News he said: "We will keep these constantly under review, but we can't predict with certainty that we will be able to lift restrictions in the week commencing February 15-22.
"What we will be doing is everything that we can to make sure that as many people as possible are vaccinated, so that we can begin to progressively lift restrictions.
"I think it is right to say that, as we enter March, we should be able to lift some of these restrictions, but not necessarily all."
Chancellor Rishi Sunak, meanwhile, unveiled a fresh £4.6 billion support package for businesses across the UK dealt a further crippling blow by enforced closures.
It includes one-off top-up grants worth up to £9,000 for firms in the retail, hospitality and leisure sectors to help nurse them through to the spring.
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The Chancellor was forced to defend himself and Mr Johnson against allegations that they have consistently been behind the curve on decision-making, telling reporters: "The Prime Minister has acted decisively in the face of new information."
Mr Sunak also said he would "take stock" of government support packages in March's Budget, when pressed on whether he would extend the furlough scheme to prevent a wave of business closures and redundancies.
