But when are you allowed out - and how long for? Should you be isolating completely? These are the rules right now:

Regular residents - those without underlying health conditions and aged under 70

STAY HOME as much as possible. Do not see friends or visit any other houses if you don't live there.

People will now only be allowed out of their homes to buy essential supplies, to exercise once a day, for medical visits or to provide care or to help a vulnerable person, or to travel to and from work. The Prime Minister encouraged people to only buy food when absolutely necessary and to use food delivery services instead where possible.

However employees should only go to work where it is absolutely necessary.

Those failing to comply could be fined as police will have extra powers to tackle people not complying.

People will not be allowed to gather in groups and must maintain a distance of two metres to all others at all times.

Boris Johnson also said on Monday night that people must not visit friends or family and must stay away from anyone who doesn't live in their household.

Those displaying symptoms

STAY HOME and do not leave at all for at least 14 days. IF you display symptoms - any symptoms - you must self isolate for 14 days. That means no leaving the house at all. Everyone in your household must also self-isolate for 14 days.

Food can be delivered to you but you must not go out.

Those with symptoms are being told not to contact the NHS on 111 unless your symptoms get significantly worse, or you have an underlying health condition or are a vulnerable person.

Vulnerable people

Vulnerable people MUST self isolate completely for 12 weeks. No leaving the house, and anyone coming to visit must wash their hands on entry and exit.

Those falling into this category will get a letter or text from the NHS this week.

STAY HOME and do not leave for 12 weeks. The guidance says: "You are strongly advised to stay at home at all times and avoid any face-to-face contact for a period of at least 12 weeks from the day you receive your letter.

What counts as vulnerable: Anyone aged over 70, anyone who has to have a flu jab, and anyone with underlying health conditions such as asthma, diabetes and cancer.

The full list is:

Solid organ transplant recipients

People with specific cancers

People with cancer who are undergoing active chemotherapy or radical radiotherapy for lung cancer

People with cancers of the blood or bone marrow such as leukaemia, lymphoma or myeloma who are at any stage of treatment

People having immunotherapy or other continuing antibody treatments for cancer

People having other targeted cancer treatments which can affect the immune system, such as protein kinase inhibitors or PARP inhibitors.

People who have had bone marrow or stem cell transplants in the last 6 months, or who are still taking immunosuppression drugs.

People with severe respiratory conditions including all cystic fibrosis, severe asthma and severe COPD

People with rare diseases and inborn errors of metabolism that significantly increase the risk of infections (such as SCID, homozygous sickle cell disease)

People on immunosuppression therapies sufficient to significantly increase risk of infection

Women who are pregnant and who also have significant heart disease, congenital or acquired

-> For the latest news and coronavirus advice in Leeds, go to www.facebook.com/groups/leedscoronavirus

When can I go out? Coronavirus lockdown rules explained for regular residents and vulnerable groups