British Prime Minister Boris Johnson announced a new national COVID-19 lockdown in England on Monday, instructing people to stay at home to contain a more contagious variant of the coronavirus.

The measures are similar to the lockdown imposed last March, and include asking the public to stay at home and leave for only limited reasons. Trips outside will be allowed for only essential shopping, exercise, Covid-19 testing, medical help, escaping domestic abuse and work for those who can’t work from home.

Primary, secondary schools and colleges will also have to switch to remote learning starting Tuesday.

People who don’t live together are not allowed to mix, but support and childcare bubbles are still allowed.

Speaking in a late-night televised address, Johnson warned that the weeks ahead will be the hardest yet, but he believes the country is entering the last phase of the struggle.

“I know how tough this is and I know how frustrated you are,” Johnson said. “But now more than ever, we must pull together.”

Johnson said people should follow the new rules, which will become law in the early hours of Wednesday morning, starting immediately.

The measures announced apply only to England, where Johnson sets policy, with Scotland, Northern Ireland and Wales — the other three countries in the U.K. — setting their own rules.