Boris Johnson is expected to unveil a coronavirus warning system when he outlines his plans to gradually ease the lockdown while dropping the "stay home" slogan.
The Prime Minister will instead tell the country to "stay alert, control the virus and save lives" when he outlines his "road map" to a new normality during an address to the nation on Sunday.
Mr Johnson is planning to urge workers who cannot do their jobs from home to begin returning to their workplaces while following social-distancing rules.
"This is the dangerous bit," he warned ahead of the announcement.
It is understood that a warning system administered by a new "joint biosecurity centre" will detect local increases in infection rates, with the view to locally alter restrictions in England.
With the alerts ranging from green in level one to red in level five, Mr Johnson is expected to say the nation is close to moving down from four to three.
The PM will chair a meeting of the emergency Cobra committee with Cabinet ministers, leaders of the devolved nations and London Mayor Sadiq Khan before his pre-recorded address.
Mr Johnson's address will be broadcast at 7pm on Sunday, and is expected to last around 10 minutes.
Most major TV channels will be broadcasting the event.
On BBC One, the announcement will be followed by a BBC News special.
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