After a trip to London, this individual is no longer a resident of the United Kingdom.
There are now required face masks in shops and on public transportation in England following the government's response to the virus.
Pupils, staff, and visitors in Year 7 and above are now being advised by the Department of Education to wear face coverings in common areas of schools.
Schools, colleges, and universities, as well as childcare workers, are included in the scope of the new law.
The novel Omicron variety, which was first reported to the World Health Organization from South Africa on Wednesday, has a greater re-infection risk, according to preliminary research.
Health ministers from the G7 countries will meet Monday "to review the developments on Omicron," according to the Department of Health and Social Care.
Sajid Javid, the health secretary, told the BBC that as soon as the variant was discovered, ministers moved "swiftly" and "proportionately."
In addition, newcomers to the UK will be obliged to undergo PCR testing and isolate until they receive a negative result. On Tuesday, at 4:00 a.m. GMT, both this requirement and the mask mandate will go into effect.
And Mr. Javid stated that he expects to hear back from the Joint Committee on Immunization and Immunization (JCVI) on whether or not to prolong the booster vaccination programme within the next few days.
"A booster will be offered to adults aged 18 and over earlier than we had originally anticipated," the JCVI's deputy chairman told the BBC.
As part of its Plan B for the winter, the government has not advised workers in England to stay at home or require vaccine passports, which are part of the government's contingency plan if intervention on Covid is necessitated.
Travelers from the UK and Ireland who recently visited any of the ten countries on the UK's travel red list will be quarantined at an approved hotel for 10 days until further notice. There will be no entry into the UK for citizens of the nations listed on the red list until the status is changed.
As a key government consultant on the pandemic, Prof. Neil Ferguson stated that "it's possible we'll identify quite a lot more cases in the coming days" due to Britain's frequent flights from South Africa, where the virus variety is now circulating.
It has since been found in a number of additional nations, including Belgium and Denmark as well as the Netherlands and Australia.
According to the UK Health Security Agency (UKHSA), a third UK case had been linked to travel in the region of southern Africa. In London's Westminster district, testing is now taking place.
More cases, according to the agency, are "highly likely" to be discovered in the following days.
The UKHSA's CEO, Dr. Jenny Harries, said: "In order to prevent the spread of a disease, we use modern sequencing techniques.
"Efforts are ongoing to determine the impact of this variation on transmissibility and severity of disease as well as mortality, antibody response and vaccine efficacy.
"Anyone experiencing Covid-19 symptoms should isolate and have a PCR test done as soon as possible. Immunization is necessary in order to protect us from this new strain."
Cases were confirmed in Brentwood in Essex and Nottingham in Nottingham on Saturday, the first in the United Kingdom. People who were at a church and a KFC in Brentwood are being asked by Essex County Council to do a PCR test as part of contact tracing.