Face masks are now compulsory in all shops and supermarkets in England with flouters at risk of £100 fines.
Hours before the new measure came into effect at midnight, after much confusion and speculation, the government issued a full list of places where a face covering over your nose and mouth is mandatory.
They will also be compulsory in post offices, banks, indoor shopping centres, and when buying takeaway food and drink, for instance from a cafe.
It's already mandatory on public transport and has been since June 15.
Stores can turn away those without a mask - which can just be a a fabric covering, scarf or bandana - and police can issue £100 fines as a "last resort".
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The law - which also covers people not wearing masks over their nose, and allows police "reasonable force" to remove maskless people who refuse to leave - will remain in place for up to a year.
Exemptions include for the disabled and children under 11, while people can briefly remove their mask if asked by shop staff - for example to show ID.
It comes after there was last-minute confusion over exactly where and how the rules applied.
People won't have to wear a mask in restaurants or cafes with table service, because it is impractical to do so while eating or drinking. Pubs are also exempt.
If you're sitting down and eating in the takeaway, you don't need a mask. But if you're paying for food or drink then taking it out, you do need a mask.
Places where you must wear a face covering by law in England from July 24
- Shops, including banks and post offices
- Takeaway food and drink shops or cafes, if you're not sitting down to eat or drink and if there's no table service available.
- Supermarkets
- Indoor shopping centres - excluding any area with sit-down food and drink service
- Transport hubs - excluding any area with sit-down food and drink service
- Public transport
No10 changed the rules on masks as part of a set of new restrictions in an effort to prevent a potentially catastrophic second wave in the winter.
Metropolitan Police commissioner Cressida Dick, told LBC radio she hoped people not wearing masks would be “shamed” into leaving stores.
