Rules are clear
Up to three households will be able to form a "Christmas bubble" and meet over the festive period, it has been announced.
For five days between 23 and 27 December, people across the UK will be able to mix with those in their bubble - but only in a private home, a place of worship or outdoor public spaces.
Travel restrictions across the whole of the UK will also be lifted during the five-day period, allowing people to travel between countries or between tiers in order to meet those in their bubble.
People in Northern Ireland will be allowed an extra day either side of the five-day window to travel, in order to allow for flights.
Under the Christmas rules, once a three-household bubble is formed it cannot be changed or extended further at any point.
And - beyond private homes, places of worship and outdoor public spaces - people should continue to follow all other local restrictions in their area.
This means Christmas bubbles are unlikely to be able to meet in pubs, bars or restaurants.
However, people will still be able to meet with others outside their Christmas bubble outdoors, if allowed under the rules of the tier in which they live.
Each country will clarify their own rules on support bubbles and extended households. In England, support bubbles will continue to be counted as one household.
There will be no further relaxation of restrictions for New Year celebrations.