People in England will have to stay at home and only go out for essential reasons. Primary and secondary schools will move to online learning for all pupils apart from vulnerable and keyworker children.
Reasons to leave home include:
Those who are clinically extremely vulnerable will be advised to limit the time they spend outside the home. They should only go out for medical appointments, for exercise, or if it is otherwise essential, the government says, and not for work or education purposes.
International travel, or travel around the UK is only permitted for essential reasons.
Hospitality businesses such as pubs and restaurants and non-essential shops must close, as must indoor and outdoor sports facilities including gyms, tennis courts and golf courses.
Essential businesses and services can stay open to the public. These include:
Read the government guidance here
The lockdown will be reviewed in six weeks.