The Prime Minister imposed the strictest measures the UK has faced in peacetime as the coronavirus death toll continued to rocket.
Mr Johnson told the public the nation is facing a national emergency and said everyone must stay at home to save lives.
Police will enforce the lockdown by breaking up groups and imposing fines of £30 upwards on people who flout the rules.
Speaking in Downing Street, the PM said the only valid reasons for venturing outside were to buy food, carry out essential work or for medical reasons.
One outdoor trip for exercise each day is also allowed but there should be no more than two people together in public, except for members of the same household.
All non-essential shops have been ordered to shut down, weddings have been cancelled and religious gatherings banned.
Mr Johnson said: “The coronavirus is the biggest threat this country has faced for decades, and this country is not alone. All over the world we are seeing the devastating impact of this invisible killer.
“And so tonight I want to update you on the latest steps we are taking to fight the disease and what you can do to help.
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