Boris Johnson’s plan to review whether the coronavirus lockdown measures could be eased on Monday has been shelved.

Announcing the drastic restrictions to tackle the Covid-19 outbreak, the Prime Minister committed to inspect the evidence to see if the measures could be eased in three weeks.

But Foreign Secretary Dominic Raab announced the abandoning of that at the daily press conference on Tuesday as he deputises for Mr Johnson, who is in intensive care with the virus.

Downing Street confirmed that the review would not go ahead on the scheduled date and said it would instead take place after the three-week mark.

The move came as the chief scientific adviser suggested the peak of the outbreak could be being approached, but he stressed the evidence would not be available for at least another week.

Mr Raab was pressed on whether the review would take place as scheduled at the Downing Street briefing.

“The critical thing is to take evidence-based decisions and so we’ve said that we will take any review once we’ve got the evidence that the measures are working,” he said.

“And having the kind of impact taking us past the peak which means that they can be responsibly done. We’re not at that stage yet.”

The emergency legislation laid before Parliament three days after the PM’s announcement states that a review must take place every 21 days, with the first deadline on April 16.

England’s chief medical officer Professor Chris Whitty said the peak – where the virus is at its most widespread – must be in the past before decisions can be made.

“It’s really important that we get to the point that we’re all confident that we’re beyond the peak and then at that point start making it clear what combination of things and over what period of time seems a sensible combination to take us through,” he said.

Coronavirus – Mon Apr 6, 2020
People have been permitted one form of exercise per day (Steve Parson/PA)

The Government’s chief scientific officer, Sir Patrick Vallance, said it is possible the nation is seeing the beginning of the steadying of the coronavirus rate.

“We won’t know that for sure for a week or so,” he added.

“There hasn’t been the accelerated take-off and again it’s possible that we’re beginning to see the start of a change where we might see numbers flattening off,” he said.

“It does begin to suggest that things might be moving in the right direction in terms of numbers and it’s important that we carry on with the measures that we have got in place in order to make sure that this does go in the right direction.”

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(PA Graphics)

Mr Johnson announced the unprecedented measures to ease the burden on the NHS by slowing the disease’s spread in a televised statement on March 23.

He ordered the closure of all non-essential shops, banned all travel that is not absolutely necessary and permitted only one form of exercise per day.

“And I can assure you that we will keep these restrictions under constant review. We will look again in three weeks, and relax them if the evidence shows we are able to,” he said.

After being taken to hospital on Sunday while suffering persistent symptoms of the virus, Mr Johnson was moved into intensive care on Monday night.