Prime Minister Boris Johnson has announced a third national lockdown, with a strict stay at home order in place.

People in England can only leave their home for essential shopping, work (if they cannot work from home), exercise, or to fulfil caring responsibilities.

Non-essential shops must close across the country, and restaurants can only provide takeaways.

As in the previous lockdowns, supermarkets will be allowed to stay open so people can buy essential groceries.

But they will have strict rules in place to ensure the safety of both customers and staff.

Here's the latest guidance from Tesco, Asda, Aldi, Morrisons and more:

Tesco

Tesco has introduced a one-in, one-out system to reduce the number of customers shopping at any one time. This means you may have to queue outside the store.

Shoppers wearing protective face coverings to combat the spread of the coronavirus, choose items in a Tesco supermarket
Social distancing is still essential in supermarkets across the country

Customers are asked to wear a face mask (unless they're exempt), and pay by card or contactless where possible to reduce physical contact with staff.

Hand sanitiser will be available to use around the store, and customers will also have the opportunity to wipe down their trolleys and baskets with disinfectant.

Some stores have assigned separate entrances and exits, to allow for better social distancing, and others have put up a traffic light system where a green light means you can enter, but a red light means the store is at capacity and you should wait.

Asda

Asda has introduced a virtual queuing system with an app called Qudini. This allows customers to wait in their cars instead of outside in the cold.

The 100 busiest stores will use technology that counts customers, controlling how many people can shop at a time.

Queues at Asda Kingswood during the second lockdown of 2020
Asda has introduced various safety measures to combat the spread of coronavirus

Asda has also added a protective antimicrobial coating to common customer "touch points", such as fridges, baskets and trolley handles. This substance helps to kill bacteria and viruses.

All Asda customers and staff are required to wear a face mask, unless they are exempt.

Safety marshals will be on site to reiterate the rules, and to help customers comply with the government's social distancing guidelines.

Sainsbury's

Sainsbury's is currently offering priority access to elderly and vulnerable customers, and NHS workers who show their ID. They can skip the queue at any time of day.

If possible, only one adult per household should visit Sainsbury's at any one time (children are welcome) and customers are asked to pay by card. If you need to pay by cash, you should use a self-service machine.

Sainsbury's
Sainsbury's is asking people to shop 'one adult at a time'

Customers and staff are required to wear a mask, unless medically exempt.

There will be hand sanitiser stations around stores, and customers will have the opportunity to disinfect their trolley or basket.

Aldi

NHS and emergency services staff will be given priority access to Aldi at any time of day.

Other customers must follow a traffic light system that has been implemented to manage the number of customers in store at any one time.

Masks are mandatory, unless you have a medical exemption.

Morrisons

Morrisons still has a priority hour for NHS workers, who can visit between 6am and 7am Monday to Saturday, or from 9am to 9:30am on Sundays.

It has also set up a next-day delivery service for elderly, vulnerable or shielding customers who may be unable to visit a store in person.

Morrisons is operating a next-day delivery service for shielding customers

Social distancing is still in operation at Morrisons and you may have to queue. Customers who are shopping with a basket instead of a trolley can, however, skip the queue.

Lidl

Lidl encourages customers to shop at quieter times (after 2pm), and to pay by card where possible.

Customers and staff are required to wear a mask, unless they have a medical exemption. Lidl staff members who are exempt may wear a visor instead.

Trolley and basket cleaning stations are in place, and customers are encouraged to use disposable plastic gloves when choosing items at the bakery, instead of tongs.