Sunak said he accepted Williamson's resignation "with great sadness" and thanked him for his "personal support and loyalty".
The UK cabinet is on Monday holding talks to consider options for tougher lockdown restrictions as the country recorded another daily high of Omicron cases at 12,133.
'There are ominous portents of an isolationist administration not only building a physical wall to the south to prevent unwanted immigrants from entering the land of milk and honey, but also trade walls not just against China, but all nations,' foresees Sreekant Sambrani.
The UK is likely to be for another three weeks, is inevitable.
Rishi Sunak on Wednesday clinched his place for the final leg of the race to succeed Boris Johnson as leader of Britain's Conservative party and prime minister, and will go head-to-head with Foreign Secretary Liz Truss.
Nottinghamshire police said the 31-year-old suspect, who remains in custody, then went on to stab a man in his 50s to death and also attempted to run over three people - still in hospital - with a van stolen from that man.
Johnson's longstanding policy chief Munira Mirza, chief of staff Dan Rosenfield, principal private secretary Martin Reynolds, and communications director Jack Doyle all left their posts within hours of each other on Thursday, days after a damning investigation revealed that multiple parties took place at Downing Street while the rest of the United Kingdom was living under strict COVID-19 lockdown rules.
The survey also shows a majority in favour of ousted leader Boris Johnson, with 55 per cent saying that Tory MPs were wrong to effectively force him to resign and 40 per cent saying they were right.
Britain's BBC faced a mounting crisis as a row over football presenter Gary Lineker's criticism of government migration policy led to a presenter mutiny.
British Prime Minister Rishi Sunak on Thursday came under fresh pressure on the reappointment of Indian-origin Suella Braverman as home secretary after two Conservative MPs questioned his decision, days after she quit over data breaches.
From the middle of next week, shops, personal care, gyms and churches can reopen as part of a bolstered three-tiered system. As part of the restrictions, people will be expected to continue to work from home if they live in a Tier 1 region; in Tier 2, alcohol can only be served with a meal; and in Tier 3, all forms of hospitality except takeaways will have to close.
Former chancellor Rishi Sunak convincingly won over an audience of Conservative Party members in a head-to-head television debate with rival Foreign Secretary Liz Truss in the leadership contest to elect a new Tory party leader and British prime minister.
Foreign Secretary Liz Truss has extended a commanding 28 point lead over former British chancellor of the exchequer Rishi Sunak in the race to be the next leader of the Conservative party and the United Kingdom's prime minister, according to the latest YouGov survey.
In an accompanying vision statement, the former finance minister highlighted his track record of serving in the Cabinet, helping to steer the economy through the toughest of times with the COVID pandemic.
Earlier on Wednesday, Reuters reported that Swiss business tycoon Hansjoerg Wyss is considering buying football club Chelsea from Abramovich, Wyss told Swiss newspaper Blick as British lawmakers continued to push for sanctions against the billionaire.
Members of the public began filing past at 5pm local time and will have until 6.30am on the day of the funeral, by which time several thousands are expected to have queued for hours to pay their respects to the Queen.
The 80-page bill, which follows a last-minute deal agreed with the EU last week, just days before the December 31 deadline of the end of the Brexit transition period, was debated by MPs in the House of Commons followed by the House of Lords.
The 47-year-old senior cabinet minister was widely expected to become the third female British Prime Minister after 170,000 online and postal votes cast by Tory members, ending Sunak's historic run as the first member of Parliament of Indian heritage to compete for the top job at 10 Downing Street.
Downing Street confirmed that the two senior-most United Kingdom government officials had received notification from the Metropolitan Police that they would be given "fixed penalty notices".
The European Union (Notification of Withdrawal) Bill had its final debate and vote last night to allow the British Prime Minister to invoke Article 50 of the Lisbon Treaty to begin a two-year period of negotiations for the UK's new deal as a non-member of the European Union by 2019.
The new variant is said to be 70 per cent more transmissible, though health experts say there is no evidence that it is more deadly or would react differently to vaccines.
On the couple's reference to unnamed royals raising concerns over their son Archie's mixed-race heritage, the palace said the concerning issues of race would be addressed privately as a family matter.
"I cannot deliver the mandate on which I was elected," she said speaking outside Downing Street.
"God save the King" were the words with which those gathered reaffirmed the proclamation made by the clerk of the council.
The UK's lockdown, which involves strict stay at home measures with movement allowed for limited urgent purposes only if "absolutely necessary" and for one form of daily exercise, came into force on March 23 after a televised address by Boris Johnson.
The UK prime minister stressed that a complete lockdown was the only answer to prevent the overrunning of the country's state-funded National Health Service, which would be a "medical and moral disaster" beyond the raw loss of life.
Boris Johnson on Tuesday announced July 4 as the date for a significant lifting of lockdown restrictions in the country, with cinemas, museums, bars, pubs and restaurants being allowed to open their doors to the public once again.
In a big blow to embattled British Prime Minister Johnson, two of his senior Cabinet colleagues, including Chancellor Rishi Sunak, resigned on Tuesday, as they expressed their loss of confidence in his leadership amidst a spate of scandals.
Johnson's hospitalisation was described as a "precautionary step" taken on the advice of his doctor
British Prime Minister Boris Johnson led the tributes with UK Chancellor Rishi Sunak at 10 Downing Street for the National Health Service (NHS) and other key workers across care homes and public transport at 11 am local time. So far 82 NHS staff are known to have died after testing positive for the coronavirus, including many with their roots in India.
Johnson spent the Monday night in the ICU at a London hospital in a move Downing Street said was a "precaution" should the British prime minister require ventilation to aid his recovery from COVID-19.