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Boris Johnson has said he is “very optimistic” Covid restrictions in England can be lifted on 21 June, but warned “nothing can be guaranteed”.
The government will carry out a review into Covid status certificates or vaccine passports.
Speaking on a visit to a London school, the prime minister said there were “deep and complex issues” to consider.
He said his roadmap for easing lockdown measures, laid out on Monday, was “a cautious but irreversible approach”.
Cabinet Office Minister Michael Gove will lead the vaccine passport review.
Earlier Health Secretary Matt Hancock said