The UK Government has reintroduced the requirement for a confirmatory PCR test following a positive lateral flow test.
This means that if you test positive from a lateral flow device, regardless of if it was carried out on site or at home, then you and your household must self-isolate and book a PCR test within 48 hours. If the PCR test comes back negative, then you can stop isolating.
By bringing in confirmatory PCR tests, it reduces the risk of people self-isolating for 10 days with a false positive test. Although false positives are rare with less than one in every 1,000 tests, the increase in regular testing and easing of restrictions means it is important that possible COVID-19 cases are confirmed quickly and those who do need to isolate and able to get out and about as quickly as possible.
You can find out more about accessing regular testing here: https://www.knowsleynews.co.uk/reminder-about-when-and-where-to-get-tested/
If you need to book a confirmatory PCR test, or if you are experiencing COVID-19 symptoms (a new continuous cough, loss of taste or smell, high temperature) you can book a test via https://www.gov.uk/get-coronavirus-test or by calling 119. If the test is positive, you and everyone in your household, support bubble and close contacts must continue to self-isolate for 10 days. This is to prevent the further spread of the virus.