Also from the gov.uk site:
Who this guidance is for
It is important that we all take steps to reduce the spread of coronavirus (COVID-19) infection in the community to save lives and protect the NHS.
This guidance is for:
people with symptoms that may be caused by COVID-19, including those who are waiting for a test
people who have received a positive COVID-19 test result (whether or not they have symptoms)
people who currently live in the same household as someone with COVID-19 symptoms, or with someone who has tested positive for COVID-19
In this guidance a household means:
one person living alone
a group of people (who may or may not be related) living at the same address and who share cooking facilities, bathrooms or toilets and/or living areas. This may include students in boarding schools or halls of residence who share such facilities
This guidance also applies to people in your support bubble or childcare bubble.
Follow separate guidance if you have had contact with someone who has tested positive for COVID-19 but do not currently live in the same household as them. If you have arrived in the UK from overseas you may also need to self-isolate.
This guidance applies in England.
Symptoms
The most important symptoms of COVID-19 are recent onset of any of the following:
a new continuous cough
a high temperature
a loss of, or change in, your normal sense of taste or smell (anosmia)
For most people, COVID-19 will be a mild illness. However, if you have any of the symptoms above, stay at home and arrange to have a test.
There are several other symptoms linked with COVID-19. These other symptoms may have another cause and are not on their own a reason to have a COVID-19 test. If you are concerned about your symptoms, seek medical advice.
Tests for COVID-19
There are 2 main types of test currently being used to detect if someone has COVID-19:
Polymerase Chain Reaction (PCR) tests
Lateral Flow Device antigen (LFD) tests
PCR tests detect the RNA (ribonucleic acid, the genetic material) of a virus. PCR tests are the most reliable COVID-19 tests. It takes some time to get the results because they are usually processed in a laboratory. If you have symptoms of COVID-19, you should arrange to have a PCR test.
LFD tests detect proteins in the coronavirus and work in a similar way to a pregnancy test. They are simple and quick to use. LFD tests are not as accurate as PCR tests in all circumstances, but can detect a similar number of people with high levels of coronavirus as PCR tests. They are mainly used in people who do not have symptoms of COVID-19. LFD tests are being used to regularly test staff working in care homes, the NHS and schools, as well as in community programmes offering rapid tests to people without symptoms, known as ‘asymptomatic testing programmes’.
Main messages
Anyone with COVID-19 symptoms or a positive test result should stay at home and self-isolate immediately. This is because you could pass the infection on to others, even if you don’t have symptoms.
You could be fined if you do not self-isolate following a notification by NHS Test and Trace[footnote 1]. You may be entitled to a one-off payment of £500 through the NHS Test and Trace Support Payment scheme if you are required to stay at home and self-isolate.
It may be difficult for some people to separate themselves from others in their household. Not all these measures will be possible if you are living with children or have caring responsibilities but follow this guidance to the best of your ability in these circumstances.
If you have COVID-19 symptoms or have received a positive COVID-19 test result
Stay at home and self-isolate
If you develop symptoms of COVID-19, stay at home and self-isolate immediately. If you have a positive test result but do not have symptoms, stay at home and self-isolate as soon as you receive the results. Your household needs to isolate too.
If you have symptoms of COVID-19, arrange to have a PCR test if you have not already had one. Stay at home while you are waiting for a home self-sampling kit, a test site appointment or a test result. You can leave your home in a few specific circumstances, but do not go to work, school, or public areas and do not use public transport or taxis. See circumstances in which you can leave home.
If you need to leave your home to get to a test site, observe strict social distancing advice and return immediately afterwards.
If you are notified by NHS Test and Trace of a positive test result you must complete your full isolation period. Your isolation period starts immediately from when your symptoms started, or, if you do not have any symptoms, from when your test was taken. Your isolation period includes the day your symptoms started (or the day your test was taken if you do not have symptoms), and the next 10 full days. This means that if, for example, your symptoms started at any time on the 15th of the month (or if you did not have symptoms but your first positive COVID-19 test was taken on the 15th), your isolation period ends at 23:59 hrs on the 25th.
You can return to your normal routine and stop self-isolating after 10 full days if your symptoms have gone, or if the only symptoms you have are a cough or anosmia, which can last for several weeks. If you still have a high temperature after 10 days or are otherwise unwell, stay at home and seek medical advice.
If you are isolating because of a positive test result but did not have any symptoms, and you develop COVID-19 symptoms within your isolation period, start a new 10 day isolation period by counting 10 full days from the day following your symptom onset.
If you develop COVID-19 symptoms at any point after ending your first period of isolation you and your household should follow the steps in this guidance again.
Most people with COVID-19 will experience a mild illness. Seek prompt medical attention if your illness or the illness of someone in your household is worsening.
Stay as far away from other members of your household as possible, especially if they are clinically extremely vulnerable. Wherever possible, avoid using shared spaces such as kitchens and other living areas while others are present and take your meals back to your room to eat. Wear a face covering or a surgical mask when spending time in shared areas inside your home.
Take exercise within your home, garden or private outdoor space. Follow the general advice to reduce the spread of the infection within your household.