Speculation has continued for days but we now have some details on what to expect from the prime minister's announcement.
Follow live coverage on Sky News as the PM is expected to address the House of Commons at 3.30pm and lead a Downing Street news conference at 7pm
Here's what we know so far:
The government has always said the return of students to the classroom is a priority, and schools will now be the first thing to reopen.
All schools will allow all students back on 8 March under the government plans, despite concerns from teaching unions about opening up schools all at once.
From 8 March, people will be allowed to meet up with one other person outdoors in a public space.
They will be permitted to sit down for coffee or have a picnic in a park - a slight expansion on current rules allowing people to exercise with one person from another household.
As for meeting up in groups, outdoor gatherings of up to six people - or two households of any size - will be allowed from 29 March.
So far, there are no details on when people will be allowed to travel abroad again.
The Telegraph has reported that guidance telling people to stay at home and in their local area will lift on 29 March - although this does not yet give the green light to staycations.
Some reports have claimed ministers are looking at plans to allow people who live in the same household to go on holiday breaks together from April.
Bars, pubs and restaurants
Again, there is little detail on how the hospitality sector will be reopened - this may be something that is clarified by the prime minister later.
Media reports have suggested pubs and restaurants could begin serving outdoors in April, while indoor dining could be allowed in May.
Outdoor sports facilities, such as tennis and basketball courts, are expected to reopen on 29 March.
A return of organised adult and children's sport, such as grassroots football, is also expected from this date.