The measures, which came into force last night, will remain in place for at least three weeks, after which they will be reviewed. They will only be relaxed if the evidence shows this as possible.
Police and other "relevant authorities" will be given new powers to enforce the measures, including through fines and dispersing gatherings.
As of 23 March, people in the UK will only be permitted to leave their homes for one of four purposes:
The prime minister also announced:
Restaurants, pubs and bars were ordered to close on 20 March, with regulations enforcing closure in England in effect from 2pm on 21 March.
All businesses listed in government guidance (6-page / 163KB PDF) in England and Wales must close, subject to the noted exceptions. The same required closures will be extended to Scotland and Northern Ireland by ministerial direction once the Coronavirus Bill is in force, but businesses in these jurisdictions have been told to close by the governments of Scotland and Northern Ireland.
Where businesses in the exceptions remain open, they must comply with guidance from the government and Public Health England (PHE).
Other businesses can remain 'open', but people can only travel to and from the premises where absolutely necessary to fulfil their role and must comply with social distancing measures in line with PHE guidance. Everyone else should work from home.
Businesses that remain open need to specifically consider:
Businesses that will close need to specifically consider: