Tiers will be reviewed every 14 days.
It's a regional approach and Government is asking us all to work together to get the virus under control.
Find out more information on tiers, including what you can and cannot do in each tier here and click on the graphic below for a quick guide.
The Government says it has put Derby and Derbyshire into Tier 3 from 16 December primarily based on 5 key epidemiological indicators:
- case detection rates in all age groups
- case detection rates in the over-60s
- the rate at which cases are rising or falling
- positivity rate (the number of positive cases detected as a percentage of tests taken)
- pressure on the NHS, including current and projected occupancy