"This is a balance of risk between if we don't do enough the virus will take off - and at the moment that is the path we're clearly on - and if we do not change course we are going to find ourselves in a very hard problem".
Vallance said that on current trends, the daily count of cases will reach about 50,000 on October 13, and a month later exceed 200 deaths every day. Nearly 3,900 new infections were reported on Sunday, compared with a peak of 6,199 cases on April 5.
Prime Minister Boris Johnson, who is expected to address the country on Tuesday, is understood not to be in favor of a second national lockdown, which would have a crippling impact on all businesses, including film and TV production.
At this rate the virus "could" infect 50,000 a day by the middle of October and kill more than 200 a day by November, he warned.
Whitty said there was no evidence that it was a milder virus than it was in April, adding lower hospitalisation rates at the moment were because it was spreading among the less at-risk younger age groups.
There has been looming warnings of a cancer crisis after many people who would have had the disease detected early were not able to get appointments - or treatment - as quickly as needed. "If we don't do enough the virus will continue on the trajectory it is on". Scotland's First Minister Nicola Sturgeon said she hoped for "four-nation alignment" on next steps.
During a series of broadcast interviews over the weekend, however, Health Secretary Matt Hancock refused to rule out a second national lockdown in England, if people fail to follow the social distancing rules.
"That increasing case number has translated into an increase in hospitalisations".
"We all know we can not do this without some significant downsides. It is better for both health and business to move too early than too late".
Baby Yoda - and 'The Mandalorian' - won an Emmy
This year, she's also been nominated for Outstanding Lead Actress in a Limited Series or Movie for Little Fires Everywhere . This may not be Washington's only 2020 Emmy win. "So proud of @simpsonstreet and this incredible cast and crew".
The government in Cardiff meanwhile announced that three more areas of south Wales would be placed under local lockdown because of a rise in coronavirus cases.
More: Your verdict on second coronavirus lockdown for Norfolk Another 3,899 lab-confirmed cases of coronavirus in the United Kingdom were announced on Sunday, while a further 18 people died within 28 days of testing positive, bringing the United Kingdom total to 41,777.
But Sir Graham Brady, who represents Tory backbenchers, said he would table an amendment which would require the government to put any new measures to a vote of MPs.
But new Covid-19 cases are rising by at least 6,000 per day in Britain, according to week-old data, hospital admissions are doubling every eight days, and the testing system is buckling.
"This country faces a tipping point", he told BBC One's The Andrew Marr Show.
Nearly 42,000 people who have tested positive for Covid-19 have died in Britain.
Chief Medical Officer Chris Whitty told the public on Monday that rates are going in the "wrong direction" amid expectations the government is preparing to announce new measures to control the pandemic.
People on benefits will be eligible for a one-off support payment of £500 if they face a loss of earnings as a result of being required to quarantine.