Health Secretary Sajid Javid has said mandatory mask-wearing will return to shops and public transport on Tuesday, as he told families to plan for Christmas “as normal” despite new rules to combat the Omicron coronavirus variant.

He said on Sunday it was “nowhere near” time to reintroduce social distancing rules and work-from-home guidance, despite a raft of precautionary measures being reintroduced to tackle the concerning strain of Covid-19.

Passengers arriving in the UK have been told that from Tuesday morning they will have to take a PCR test for Covid-19, with the expectation they will have to self-isolate until they test negative.

All contacts with a suspected case of Omicron will have to isolate for 10 days, regardless of their vaccination status, amid concerns that existing jabs will be less effective against the strain, which is believed to spread rapidly.

Details of the plans were incomplete when announced by Boris Johnson after two cases of the variant were confirmed in England on Saturday, but Mr Javid said the “face-mask rules are planned to come in on Tuesday” to bring the nation back closer into line with Scotland, Wales and Northern Ireland.

He said it “would be irresponsible to make guarantees” during the ever-changing pandemic, but told Sky’s Trevor Phillips on Sunday: “I think people should continue with their plans as normal for Christmas, I think it’s going to be a great Christmas.”

With the Government stopping short of introducing its Plan B to tackle Covid-19 this winter, Mr Javid downplayed there being a need to reintroduce social distancing rules or work-from-home guidance.

“We know now those types of measures do carry a very heavy price, both economically, socially, in terms of non-Covid health outcomes such as impact on mental health,” he told Sky.

“So, if one was to make decisions like that they would have to be done very, very carefully and we’re not there yet, we’re nowhere near that.”

Experts hope existing vaccines will still be good at reducing serious disease from Omicron, but manufacturers are looking at tweaks to make them more specific to the variant.