Confirmed cases of the faster-spreading strain have risen by more than 12,000 in the UK
Ministers have reportedly pushed back against calls from scientific advisers for new measures, including a full lockdown, to tackle the Omicron variant before Christmas.
Confirmed cases of the faster-spreading strain have risen by more than 12,000 in the UK - and London's cases alone topped 10,000, according to the latest data on Sunday.
But around one third of the Cabinet are said to be reluctant to support new restrictions in the coming days, with Prime Minister Boris Johnson and Chancellor Rishi Sunak among them, according to The Times.
The paper reported that 10 ministers are resisting a call by the Government's chief scientific adviser Sir Patrick Vallance at the weekend for new restrictions to be brought in as soon as possible to prevent the health service being overwhelmed.
Mr Johnson has been presented with three options to tackle the spread of the virus, according to the Daily Telegraph.
The paper reported that they range from guidance asking people to limit indoor contacts, to rules on household mixing, social distancing and a curfew on pubs and restaurants, and thirdly a full lockdown.
The Telegraph quoted one unnamed Cabinet minister as saying data presented by Sir Patrick and England's chief medical officer Chris Whitty on Saturday was "just trashed by the Cabinet".
The source said "guidelines, rather than restrictions, are entirely possible".
Health Secretary Sajid Javid said it is time to be "more cautious" and did not rule out new measures before Christmas, telling BBC One's Andrew Marr programme there are "no guarantees in this pandemic".
He confirmed that if new rules were to be proposed, Parliament would be recalled to approve them, describing that approach as "only right and proper".
London's Mayor Sadiq Khan warned that if restrictions are not brought in soon the NHS could be "on the verge of collapse", with sickness affecting workforce levels.
Education Secretary Nadhim Zahawi has called on ex-teachers to sign up to help with staff shortages in the new year, while headteachers' unions have warned of possible disruption to in-person lessons.
Meanwhile, the Treasury announced on Sunday that extra funding to tackle Covid-19 across Scotland, Wales and Northern Ireland had been doubled to a total of £860 million.
Mr Sunak said the boost - which followed a ramping up of demands from the three nations for more cash support amid the rise in Omicron cases - was to ensure people were supported "in the face of this serious health crisis".
Advice from the Scientific Advisory Group for Emergencies (Sage), published at the weekend, warned there are likely already hundreds of thousands of new Omicron infections every day in England and that hospital admissions with the variant in the UK are "probably around one tenth of the true number" due to a lag in reporting.
England's chief nursing officer Ruth May has urged a "final festive booster bounce" for the jabs programme, telling people there is "no room for complacency" and to book their slots - which include availability on Christmas Day.
While a record 830,403 boosters were given in England on Saturday, a rate of around one million a day is needed if every adult is to be offered a booster jab by the end of the year.
Deaths in England of people with the variant have risen to 12, while hospital admissions of patients with confirmed or suspected Omicron increased to 104, according to the latest figures from the UK Health Security Agency.
A further 12,133 confirmed cases of the variant have been reported across the UK, the data on Sunday showed, bringing the total confirmed cases of Omicron across the four nations to 37,101.
In total, a further 82,886 lab-confirmed Covid-19 cases have been recorded in the UK as of 9am Sunday, the Government said.
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