The British death toll from coronavirus has risen to 233, with 53 further fatalities in England.
Two people died in Wales and one person died in Scotland.
In Northern Ireland, 22 extra cases of Covid-19 were reported with the total number of cases now at 108. This is the largest jump in cases since the outbreak began in the North.
The total number of people to test positive for coronavirus in the UK is now 5,018 - up from 3,983 on Friday, the British Department of Health said.
Boris Johnson has warned the coronavirus outbreak is "accelerating", as he urged people not to visit their parents on Mother's Day.
In stark message, he said the NHS was in danger of being "overwhelmed" in the same way as the Italian healthcare system unless people heeded Government advice on "social distancing".
It came as ministers urged the 1.5 million people in England considered to be most at risk from the disease due to their health conditions to begin "shielding" themselves by staying at home.
Letters will go out this week to those concerned, "strongly advising" them not to go out for at least 12 weeks from Monday.
Prime Minister Johnson acknowledged his government was imposing measures "never seen before either in peace or war", but said they were essential as the outbreak gathered pace.
"The numbers are very stark, and they are accelerating. The Italians have a superb health care system. And yet their doctors and nurses have been completely overwhelmed by the demand," he said.
"The Italian death toll is already in the thousands and climbing. Unless we act together, unless we make the heroic and collective national effort to slow the spread - then it is all too likely that our own NHS will be similarly overwhelmed."
Mr Johnson said that while "everyone's strongest instinct" was to visit their mother on Mother's Day, the best single present they could give her was to stay away and spare her the risk of becoming infected.
"This time the best thing is to ring her, video call her, Skype her, but to avoid any unnecessary physical contact or proximity," he said.
"And why? Because if your mother is elderly or vulnerable, then I am afraid all the statistics show that she is much more likely to die from coronavirus, or Covid-19. We cannot disguise or sugar coat the threat."