A proposal also mentioned possible evening curfews for areas with high case numbers, though a precise curfew time was not mentioned.
A proposal also mentioned possible evening curfews for areas with high case numbers, though a precise curfew time was not mentioned.
Some 2.2 million people have had both doses of a vaccine, the data showed.
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The warning comes as the European Union struggles to speed up its inoculation campaign.
Britain has vaccinated nearly 27 million people.
Schools will stay open and outdoor exercise allowed up to 10 kilometres (6 miles) from home.
Around a dozen countries had suspended the use of the vaccine and were awaiting the outcome of an investigation.
Incidents were no higher in vaccinated groups than among the unvaccinated.
All those who are permitted to enter England from these countries, will have to quarantine for 10 days in a managed quarantine hotel.
The European Medicines Agency urged governments not to halt use of the vaccine at a time when the pandemic is still taking thousands of lives each day.