Quarantine
Plan to get new variants under control, first revealed on January 27, will begin on February 15.
Keir Starmer has accused the government of causing "chaos and confusion".
It comes amid ongoing confusion and conflicting statements from ministers about when the policy will come into force.
Move piles pressure on Boris Johnson to impose restrictions beyond "red list" countries.
It's hoped the program will halt the spread of the South African variant of Covid-19.
Anyone arriving in the UK from 30 Covid hotspots will soon have to quarantine in hotels. Scientists have been suggesting it since April.
Border restriction aimed at returning Brits will stop new variants of coronavirus from taking hold, says the government.
As the UK unveils its own mandatory hotel quarantine system, the experience from Australia makes for sobering reading.
Ministers expected to make decision at Tuesday meeting.
Professor John Edmunds said it was only useful if made "as effective as you possibly can".