Sajid Javid says there are "no guarantees" in the pandemic when asked if he can rule out new restrictions before Christmas
The health secretary says ministers are challenging scientific data and considering wider factors before bringing in more measures
London Mayor Sadiq Khan says more restrictions such as social distancing and limits on household mixing are "inevitable"
The hospitality industry has warned that more restrictions could be a "nail in the coffin" for many firms
Brexit minister Lord Frost resigned on Saturday saying he hopes the government will not be tempted by "coercive measures" seen elsewhere
Hundreds of extra sites have opened across the UK this weekend to deliver booster jabs
It comes after 10,000 new Omicron cases are confirmed in the UK and London declares a major incident
Germany is to ban British tourists and business travellers from entering the country from tonight
The Netherlands is entering a strict lockdown over Christmas amid fears about Omicron
Sadiq Khan has urged Londoners to get vaccinated.
He told Andrew Marr that more than 15 million vaccines had already been delivered in the city and more is being done to encourage people to take up the offer for a Covid jab.
Speaking directly to the camera, he said that vaccines and boosters offered the best protection, and urged people to encourage their families to take up the offer of a jab.
Asked if Londoners should be planning new year parties, Khan says celebrating with direct family members at home is fine.
But if you're meeting with strangers and not had a lateral flow test, "err on the side of caution", he says.
He says people should continue go to pubs if they can do so safely - again, by taking lateral flow tests and wearing masks when they travel.
The Mayor of London Sadiq Khan is also appearing on the Andrew Marr show, and he begins by saying that new Covid restrictions such as social distancing and limits on household mixing are inevitable.
He says he hopes the prime minister understands the challenges London is facing.
He said the government must step in and support businesses.
The BBC's last ever Andrew Marr programme has started - he is leaving the BBC after 21 years.
Health Secretary Sajid Javid is due to appear shortly and we'll also be hearing from London Mayor Sadiq Khan, who yesterday declared a "major incident" in the capital as cases surge.
We'll be bringing you live updates throughout the programme.
Health Secretary Sajid Javid is due on the Andrew Marr show shortly, but he's already been speaking to Sky News.
On any further measures to stop the spread of Covid, he said the situation remains under review.
Asked about reports that a two week circuit breaker is being planned, he said any move would need to be backed by data.
He also confirmed that if more measures are needed Parliament would be re-called.
Image source, EPABrexit minister Lord Frost led the UK's negotiations over the EU Withdrawal Agreement and Northern Ireland Protocol. He resigned on Saturday.
In his resignation letter, he said that while "Brexit is now secure" he had "concerns about the current direction of travel".
The Mail on Sunday, which first reported the news, said he handed in his resignation a week ago, partly in disagreement with Covid curbs.
In his letter, Lord Frost said his resignation would take "immediate effect" and spoke of his desire to see a "low-tax" economy.
He added that measures to reopen the economy in July "did not prove to be irreversible", saying: "I hope we can get back on track soon and not be tempted by the kind of coercive measures we have seen elsewhere."
Let's have a look at today's papers.
Several of them are leading on Lord Frost's resignation as Brexit Minister.
The Sunday Telegraph thinks the move creates a "major new crisis" for Boris Johnson, external while the The Sunday Times argues that the problems engulfing the prime minister have "deepened", external.
Health Secretary Sajid Javid has acknowledged in the Sunday Telegraph that "there is much we still don't know" about Omicron and "it may be too late to react".
Covid also dominates some of the front pages with The Sunday People, external reporting on a warning from health leaders that up to 50,000 NHS staff could be off sick by Christmas Day, as the Omicron variant "rips through the workforce".
Image source, PA MediaHealth Secretary Sajid Javid
Sajid Javid says "there is much we still don't know" about Omicron and warns "it may be too late to react".
Writing in the Sunday Telegraph, external he has said "we have to be clear-eyed about the challenge Omicron presents".
The health secretary admitted that standing in Parliament this week and arguing for Plan B brought him "no joy".
"Promoting individual freedom and opportunity is one of the reasons I got into politics," he wrote.
However, he added: "But we have to be clear-eyed about the challenge Omicron presents.
"Our strategy since it emerged has been and remains to buy time for our scientists to assess the threat and build up our defences... Together we are taking a responsible and proportionate response."
He'll be appearing on The Andrew Marr Show shortly - it starts at 09:00GMT - and we'll bring you coverage of what he says then.
In the UK another 90,418 daily Covid cases were reported on Saturday - following days of record highs.
More than 10,000 new Omicron cases have been confirmed and a major incident has been declared in London.
Scientific advisers have warned England's hospital admissions could reach 3,000 a day without new measures.
Saturday's data - which included the second-highest number of cases since mass testing began last year - also saw another 125 deaths recorded within 28 days of a positive test, down slightly on a week ago.
More than 800,000 booster doses were reported for the second consecutive day on Saturday, with 817,625 third jabs.
Image source, ReutersA major incident is any emergency that requires the implementation of special arrangements by one or all of the emergency services, the NHS or the local authority.
It means the emergency services and hospitals cannot guarantee their normal level of response.
Major incidents have previously been called in response to the Grenfell Tower fire in June 2017, and the terror attacks at Westminster Bridge and London Bridge.
London Mayor Sadiq Khan also declared a major incident on 8 January due to the rapid spread of Covid-19 and its impact on the health service.
It was in place until 26 February as case numbers in the capital fell.
Omicron: Sadiq Khan declares major incident in London
Image source, ReutersA major incident was declared in London on Saturday and more than 10,000 new Omicron cases confirmed in the UK.
London Mayor Sadiq Khan said this showed "how serious things are".
A further 90,418 daily Covid cases were reported across the UK, after days of record highs.
Scientific advisers have warned that England's hospital admissions could reach 3,000 a day without new measures.
Restrictions "similar in scale to the national lockdown" would be required to keep hospital admissions from Covid below previous peaks, the modelling advisers to the government said, in newly-released minutes, external.
Image source, Getty ImagesAustralia's most populous state, New South Wales, has recorded more than 10,000 Covid cases in just five days.
Another 2,566 cases were reported on Sunday, days after mandates were lifted for masks and QR code check-ins at shops and restaurants.
But despite concerns from health experts and some members of his own cabinet, State Premier Dominic Perrottet is resisting calls to re-instate more restrictions.
In a video posted on social media, Mr Perrottet said they had to "learn to live alongside the virus", adding: "The best way of doing that is to continue the strong vaccination rate."
Nationwide, Prime Minister Scott Morrison has steered clear from talk of lockdowns, stressing that hospitals had been preparing for any surge in admissions.
"The case numbers are not translating into immediate pressure, but that's not to say it won't,” he said.
"We're ready for this. We planned to live with the virus, we didn't plan to remain shut in," the prime minister added.
Image source, Getty ImagesThe Netherlands has become the first European country to bring back a strict lockdown as it tries to control the spread of Omicron.
Under the new rules - which came in today - non-essential shops, bars and other public venues are now closed until at least 14 January.
Events are banned around the country apart from funerals, weekly grocery markets and professional sports matches with no spectators.
There are also strict limits on the number of people who can meet at a time.
Prime Minister Mark Rutte has said the measures were “unavoidable”, and a failure to act would likely lead to “an unmanageable situation in hospitals”.
Image source, GettyGermany has become the latest European country to ban most travellers from Britain as it tries to slow the spread of the Omicron variant.
German nationals and residents will still be allowed to enter from the UK.
They must have a negative test and quarantine for two weeks, regardless of whether they have been vaccinated.
The measures take effect from Sunday evening - France has already introduced similar curbs as coronavirus infections surge in Britain.
Read here for more details.
We'll be bringing you the latest updates on the top coronavirus headlines from around the world throughout today.
These are the main developments so far: