When will the Covid-19 tiers be reviewed and how are they decided?

More than 55 million people will be placed into Tier 2 and Tier 3 measures on December 2, meaning mixing between households indoors will effectively be banned for the vast majority of England (Dominic Lipinski/PA)
More than 55 million people will be placed into Tier 2 and Tier 3 measures on December 2, meaning mixing between households indoors will effectively be banned for the vast majority of England (Dominic Lipinski/PA)