A growing number of areas across England have been placed into a different tier system - but what are the coronavirus rules?
We've put together everything the restrictions mean - including what you can and can't do.
What are the rules in Tier 3?
This is the strictest level of restrictions. Expect extreme curbs to your social life – social mixing is banned both indoors and in private gardens, while pubs and bars must close unless they can operate as a restaurant.
The rule of six applies in some outdoor settings such as parks, public gardens and sports courts.
Deliberately flouting the rules can net you a fine of up to £6,400, while those who organise gatherings of more than 30 people can be fined up to £10,000.
Local leaders help the Government to determine whether other venues should be closed, such as gyms or casinos.
Shops and places of worship can remain open, as can schools and colleges, while universities must reflect wider restrictions with the option to move to greater online provision.
Up to 15 guests are allowed at weddings and 30 people can attend funerals, with 15 allowed at wakes, but wedding receptions are not permitted.
People living in Tier 3 areas are advised against overnight stays in other parts of the UK and should avoid travel where possible in and out of the area, unless it is for work, education or caring responsibilities.
Number 10 confirmed that, under Tier 2 and 3 rules on household mixing, people can still meet up for work meetings indoors under certain circumstances.
Under additional measures agreed for Nottinghamshire, people have been informed they cannot purchase alcohol in shops after 9pm, but can buy it in pubs with a substantial meal until 10pm.
What are the rules in Tier 2?
This is the medium level of the three tier system across England. Areas categorised as high risk have restrictions on household mixing indoors, while the rule of six continues to apply outdoors.
People must not meet socially with friends and family indoors in any setting unless they live with them or have formed a support bubble with them.
Shops, gyms, all education settings, and places of worship can remain open, with overnight stays permitted.
Up to 15 guests are allowed at weddings and up to 30 people allowed at funerals, with 15 allowed at receptions and wakes.
Travel advice for those living in Tier 2 areas is to reduce the number of journeys they take where possible and avoid travel into very high Tier 3 areas.
What are the rules in Tier 1?
Areas classed as medium risk, those in Tier 1, are subject to the same national measures which were commonplace across England earlier this year.
These include the 10pm curfew for pubs and restaurants and a ban on most gatherings of more than six people.
Like Tier 2, up to 15 guests will be allowed at weddings and up to 30 people are allowed at funerals, with 15 allowed at receptions and wakes.
Shops, gyms, all education settings, and places of worship will remain open, with overnight stays permitted and no travel restrictions within the area, although people are advised to avoid travel into Tier 3 areas where possible.
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