The number of people who have died in the UK due to the coronavirus has risen to 336.
According to Britain's Department of Health and Social Care, 6,650 people have tested positive and 77,295 negative.
Today, another 46 people died in England, as well as four more in both Scotland and Wales. A patient aged in their 60s became the third person in Northern Ireland who died from the illness.
British Prime Minister Boris Johnson has placed the UK on lockdown in a bid to tackle the coronavirus, threatening police fines for anyone who ignores new measures including a ban on public gatherings of more than two people.
He made the announcement in a televised address.
Meanwhile letters are going out to 1.5 million people with underlying health conditions who are considered to be the most vulnerable to the coronavirus telling them to stay at home for the next 12 weeks.
There was anger among MPs at scenes over the weekend of crowds flocking to parks, markets, beaches and beauty spots.
Labour's health spokesperson Jonathan Ashworth said ministers should be making "immediate preparations" for the "next stage" while learning from other European nations.
The calls came as an 18-year-old was thought to have become the youngest victim of the virus in Britain as the number of deaths in the UK rose to 281.
Britain's Health Secretary Matt Hancock said it was "selfish" of people to continue to socialise as the NHS battles to tackle the coronavirus epidemic.
Asked why people were ignoring the advice for social distancing, the Cabinet minister told BBC Radio 4's Today programme: "I don't know, because it is very selfish.
"The NHS is doing everything it can and preparing for the spread of this virus.
"If people go within two metres of others who they don't live with, then they are helping to spread the virus and the consequence of that costs lives and it means, for everyone, this will go on for longer.
"Until we get a grip on the spread of this virus with the kinds of measures we have taken, then we can't start to get our way out of it as a country."
Mr Hancock defended the Prime Minister's approach to tackling coronavirus, saying Mr Johnson's messaging on social distancing had been "very clear".
"The message yesterday was incredibly clear - it is across every single front page," the Secretary of State said. "It is that if people don't follow the rules, we are going to have to get tougher still.
"That was very clear from the news conference, it is very clear in how it has been communicated. That's what we are going to be looking at today.
"The message is you have to stay away from others, you have to avoid unnecessary social contact. That is very important, that is very clear."
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Mr Hancock said ministers were prepared to take stricter measures to clampdown on the spread of the virus if necessary.
He said: "on Saturday I signed the order to give the police the power to be able to shut bars, restaurants and pubs if they are still open."
There are growing fears that Britain is on a similar trajectory to Italy - scene of the world's worst outbreak - where the death toll passed 5,000 over the weekend.
The Italian government was one of a number of European countries to announce new or extended restrictions - with Germany banning public gatherings of more than two people not from the same household.
Meanwhile, all jury trials in England and Wales are to be put on hold as part of ongoing efforts to halt the spread of Covid-19.
In a statement, Lord Chief Justice Ian Burnett said no new trials will start and that ongoing trials will be paused while arrangements are put in place so they can continue safely.
While people were heading to open spaces, there were signs that city and town centres were closing down with McDonald's, John Lewis, Primark and Timpson among the high street chains to announce they were closing their doors.
