Millions of people in Tier 4 face having a very different Christmas, with households banned from meeting together to celebrate.
But thanks to a loophole Prime Minister Boris Johnson will still be allowed to meet with his family, despite living in Downing Street in Tier 4 London.
The rule, which came into force on December 2 and was updated on December 14, means that Boris and his fiancee Carrie Symonds can meet up with people from one other household over Christmas - reports the Financial Times.
And the same rule applies to 750,000 households across the UK.
The exception comes because Boris and Carrie have a child aged under one.
That means they can form a support bubble - even in Tier 4 - and can then meet up with another household - of any size - whenever they want.
The Government has made it clear people should not be travelling or meeting up where it isn't necessary - especially in Tier 4 - and travelling out of Tier 4 should be avoided.
But the rules are still in place, and still allow families like Boris's to spend Christmas together.
Jemima Kelly, writing in the FT, said: "Downing Street told us the prime minister would remain at Downing Street on Christmas Day, but declined to comment on whether he and Ms Symonds would be joined by members of a support bubble, or indeed whether they had made use of the linked household exemption that applies to them since it came into law on December 2nd.
"Downing Street also declined to comment on where the prime minister and his fiancée would be spending the days after Christmas, saying such details are not usually disclosed about the prime minister."
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The Tier 4 rules state: "You cannot meet other people indoors, including over the Christmas and New Year period, unless you live with them, or they are part of your support bubble."
The support bubble rules state: "You can form a support bubble with another household of any size if...your household includes a child who is under the age of one or was under that age on 2 December 2020."
The bubble rules also allow you to meet up with one other household if you live by yourself, you are the only adult in your household who does not need continuous care as a result of a disability, your household includes a child with a disability who requires continuous care and is under the age of 5, you are aged 16 or 17 living with others of the same age and without any adults or you are a single adult living with one or more children who are under the age of 18 or were under that age on 12 June 2020.
