A new tier system for England comes into effect on December 2 as part of the government’s new Covid winter plan.
It means a new patchwork of local lockdowns for England, with areas placed into tiers 1, 2 and 3.
While the world awaits the rollout of vaccines, Boris Johnson has said the new regime will be in force until March.
Tier 3 is the strictest but government will review measures for all areas every two weeks.
The government had unveiled the news via a postcode checker tool on its website, which crashed almost immediately afterwards.
Those areas to face Tier 3 restrictions tally with a HuffPost UK analysis of the latest infection and transmission rate data
Out of the top 12 areas with the highest rates of coronavirus, only Greater Manchester and South Yorkshire had been in tier 3 before the national lockdown.
Here is everything you need to know about the new system.
What tier is my area in?
Tier 3
North-east
Hartlepool
Middlesbrough
Stockton-on-Tees
Redcar and Cleveland
Darlington
Sunderland
South Tyneside
Gateshead
Newcastle upon Tyne
North Tyneside
County Durham
Northumberland
North-west
Greater Manchester
Lancashire
Blackpool
Blackburn with Darwen
Yorkshire and Humber
The Humber
West Yorkshire
South Yorkshire
West Midlands
Birmingham and Black Country
Staffordshire and Stoke-on-Trent
Warwickshire, Coventry and Solihull
East Midlands
Derby and Derbyshire
Nottingham and Nottinghamshire
Leicester and Leicestershire
Lincolnshire
South-east
Slough (remainder of Berkshire is tier 2)
Kent and Medway
South-west
Bristol
South Gloucestershire
North Somerset
Tier 2
North-west
Cumbria
Liverpool City Region
Warrington and Cheshire
Yorkshire
York
North Yorkshire
West Midlands
Worcestershire
Herefordshire
Shropshire and Telford & Wrekin
East Midlands
Rutland
Northamptonshire
East of England
Suffolk
Hertfordshire
Cambridgeshire, including Peterborough
Norfolk
Essex, Thurrock and Southend on Sea
Bedfordshire and Milton Keynes
London
all 32 boroughs plus the City of London
South-east
East Sussex
West Sussex
Brighton and Hove
Surrey
Reading
Wokingham
Bracknell Forest
Windsor and Maidenhead
West Berkshire
Hampshire (except the Isle of Wight), Portsmouth and Southampton
Buckinghamshire
Oxfordshire
South-west
South Somerset, Somerset West and Taunton, Mendip and Sedgemoor
Bath and North East Somerset
Dorset
Bournemouth
Christchurch
Poole
Gloucestershire
Wiltshire and Swindon
Devon
Tier 1
South-east
Isle of Wight
South-west
Cornwall
Isles of Scilly
What are the different rules in different tiers?
Tier 3
Household mixing both indoors and outdoors is banned. The rule-of-six for gatherings in public gardens or parks applies.
Shops, gyms, hairdressers, beauty salons and leisure centres will be open.
Hospitality venues such as pubs and restaurants, hotels and indoor entertainment venues will be forced to close. Delivery and takeaway services will be permitted, however.
Attending indoor and outdoor sport events is banned.
People should avoid travelling outside their area except for work, education or health reasons.
People should work from home where possible.
Tier 2
Mixing of households indoors will be banned and the rule-of-six for social gatherings applies for outdoors.
Shops, gyms, hairdressers, beauty salons and leisure centres will be open.
Pubs and restaurants can open but alcohol can only be served with a substantial meal, with the same opening times restriction as in tier 1.
Collective worship and weddings can take place, with a maximum of 15 guests.
Outdoor sports can take place but there is a maximum crowd of 50% of overall capacity or 2,000, whichever is smaller.
Indoor sport can take place with a maximum of 1,000 spectators.
People should work from home where possible.
Tier 1
The rule-of-six for social gatherings, both indoor and outdoor, will be enforced, unless for work and education purposes.
Shops, gyms, hairdressers, beauty salons and leisure centres will be open.
Pubs and restaurants can open, but there is table service only and venues must take last orders at 10pm and close their doors at 11pm.
Collective worship and weddings can take place, with a maximum of 15 guests.
Outdoor sports can take place but there is a maximum crowd size of either 50% occupancy of the stadium or 4,000 spectators, whichever number is smaller.
Indoor sport can take place with a maximum of 1,000 spectators.
People are encouraged to minimise travel and to work from home where possible.
How are tiers decided?
The government has said the tiers are non-negotiable but will be reviewed every 14 days.
What areas are in which tiers are decided using five criteria:
1. An analysis of cases among all age groups
2. An analysis of cases among the over-60s, who are more vulnerable to coronavirus
3. The R rate and how quickly cases are rising
4. How many cases per thousand of the local population
5. The projected pressure on local NHS services