Meanwhile, Professor Neil Ferguson of Imperial College London said that the British capital was "going to be very difficult in the next two to three weeks".
"All I would say is, with the lockdown
now in place, those numbers are going to start to plateau. The challenge we have is there's a lag.
"The people being admitted to hospital right now were infected a week, two weeks, even sometimes three weeks ago, so without doubt the next one (or) two weeks are going to be very difficult," he added.
On Friday, Prime Minister Boris Johnson
announced that he tested positive for the novel coronavirus
but would continue to discharge his duties from self-isolation.
He becomes the second high-profile British leader to test positive for coronavirus in recent days after Prince Charles, the heir to the the throne.
Some ministers in the Johnson government and MPs have also tested positive for COVID-19, including Health Secretary Matt Hancock whose announcement came shortly after the Prime Minister's.
The UK has so far reported 14,751 confirmed coronavirus cases with 761 deaths.
Trump speaks with UK PM Johnson, wishes him speedy recovery
US President Donald Trump on Friday spoke with the UK Prime Minister Boris Johnson
after the British leader tested positive for the deadly novel coronavirus and wished him speedy recovery.
Johnson in a video message on Friday said that he has tested positive for coronavirus after experiencing "mild symptoms", becoming the first world leader to announce the infection.
In the message posted on Twitter, the 55-year-old Johnson said he will continue to lead the UK government's response to the deadly virus, which has claimed several lives in the country.
Fitch downgrades UK debt to AA-, outlook negative
Fitch Ratings on Friday downgraded Britain's debt a notch and lowered the outlook to negative, citing the "significant weakening" of public finances and damage to the economy from the coronavirus pandemic.
"The coronavirus outbreak has inflicted an unprecedented shock on financial markets and economic activity, with policymakers struggling to avert a longer-lasting downturn," Fitch said in a statement.
In addition, lingering uncertainty over Brexit and the "uncertainty around the future trade relationship with the EU could constrain the strength of the post-crisis economic recovery.