Despite the new rules, Boris Johnson said on Sunday the UK faced an "Omicron emergency", with a "tidal wave" of the new variant coming.
In a televised address, he said boosters would be offered to everyone over 18 in England from this week, with the aim of giving a jab to everyone who wants one by the end of the month.
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Extra measures - known as Plan B - were announced last week amid growing concern over Omicron, which is spreading rapidly and is expected to become the dominant variant in the UK this week.
MPs are expected to vote on the new measures on Tuesday.
People in England should now work from home if they can, as part of the government's Plan B guidance to curb the spread of Omicron. The change brings England in line with Scotland, Wales and Northern Ireland. But some businesses in city centres fear the move means they will lose customers in the run up to Christmas.
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