What is the rule of six?
The rule of six states any gathering of more than six people in England is illegal unless it meets one of the exemptions.
This applies to people meeting both indoors and outdoors.
From Thursday, adult team sport events can only now have six players and across the country, COVID-secure marshals will be hired to crack down on rule-breakers.
Fines have increased, with people who break the rules fined £200 for a first offence.
Children and babies count as one person, no matter their age.