It comes as the UK recorded 15,116 more COVID cases and 81 more deaths on Saturday.
This is an increase from 13,864 infections on Friday, 12,827 seven days ago and 6,739 two weeks ago.
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8:18 a.m. update: England has now reached levels of COVID similar to wave one
Professor Jonathan Van-Tam warned people to wash their hands, cover their faces and maintain social distancing to help keep transmission rates low.
He said: “In our national fight against COVID, we are at a similar tipping point as we were in March, but we can prevent history from repeating itself if we all act now.
“Earlier this year, we were battling a semi-invisible disease, about which we had little knowledge, and it has spread at high speed in the community.
“Now we know where it is and how to deal with it – let’s seize this opportunity and prevent history from repeating itself. ”
7:39 am update: what happens after another lockdown
Wokingham MP John Redwood has raised concerns about the new restrictions leading to another lockdown and how that would eventually be lifted.
Mr Redwood said: “Before imposing a new lockdown, the government needs to explain how it will be lifted and how it stops the virus after the lockdown. ”
He tweeted earlier: “Suppose there isn’t an early fix for all vaccines. We need to allow people to continue working in the safest way possible.
“We cannot return to national lockdown without serious economic damage. “