Strict new curbs on life in the UK to tackle the spread of coronavirus have been announced by the prime minister.
From this evening people must stay at home except for shopping for basic necessities, daily exercise, any medical need and travelling to and from essential work.
Shops selling non-essential goods are being told to shut and gatherings in public of more than two people who do not live together are to be prohibited.
The UK death toll has reached 335.
If people do not follow the rules police will have the powers to enforce them, including through fines and dispersing gatherings, Boris Johnson said in a televised statement from Downing Street.
Other premises including libraries, playgrounds and outdoor gyms, and places of worship must also close immediately.
Parks will remain open for exercise but gatherings will be dispersed.
The government is also stopping all social events, including weddings, baptisms and other ceremonies – but funerals will be allowed.
Mr Johnson said the restrictions would be kept under constant review.
“We will look again in three weeks, and relax them if the evidence shows we are able to,” he added.
Scotland’s First Minister Nicola Sturgeon said the new restrictions “amount to a lockdown” and are “not done lightly”.
“I am not going to sugarcoat it in any way,” she said. “Coronavirus is the biggest challenge of our lifetime.”
In a tweet, First Minister of Northern Ireland Arlene Foster urged people to follow the restrictions “to save lives and protect our hospitals”.
First Minister of Wales Mark Drakeford said “these are really big changes for us all”.
“We are making them because of the speed the virus is continuing to spread,” he added.
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The prime minister said the measures were necessary to tackle “the biggest threat this country has faced for decades”.
“Without a huge national effort to halt the growth of this virus, there will come a moment when no health service in the world could possibly cope; because there won’t be enough ventilators, enough intensive care beds, enough doctors and nurses,” he said.
“And as we have seen elsewhere, in other countries that also have fantastic health care systems, that is the moment of real danger.
“To put it simply, if too many people become seriously unwell at one time, the NHS will be unable to handle it – meaning more people are likely to die, not just from coronavirus but from other illnesses as well.”
Ministers and officials have become concerned about reports of people failing to observe the advice about social distancing.
The sunny weather at the weekend led to people flocking to parks and other outdoor places to enjoy the start of summer, while images of commuters packed on to trains and tubes have also raised alarm.
The figures show the number of positive cases are beginning to rise quickly and there is a desire – now we have gone down this route – that the gains from reducing social contact are maximised.
If we halve exposure, new infections could fall by more than 95%.
Scientists currently believe that each person with coronavirus infects 2.5 people and that takes about five days. Thirty days after that first infection, that means more than 400 people will be infected.
But if we all reduce our exposure by half, after 30 days, that first infection would have led to only 15 infections.
The prime minister said he knew the “damage” the restrictions were causing to people’s lives, businesses and jobs but at present there were “no easy options”.
“The way ahead is hard, and it is still true that many lives will sadly be lost,” he said.
However, Mr Johnson said there was “a clear way through”, by strengthening the NHS with former clinicians returning to work, accelerating the search for treatments and a vaccine and buying millions of testing kits.
A further 46 people have died in England since Sunday – aged between 47 and 105 and all with underlying health conditions – while there were four deaths in Scotland and four in Wales.
There have been 83,945 tests to date, with 6,650 confirmed cases of coronavirus in the UK.
Meanwhile, people in the most at-risk groups have begun receiving an NHS text urging them to stay at home for 12 weeks.
