From 11 January in England, people who receive positive lateral flow device (LFD) test results for coronavirus (COVID-19) will be required to self-isolate immediately and won’t be required to take a confirmatory PCR test.
This is a temporary measure while COVID-19 rates remain high across the UK. Whilst levels of COVID-19 are high, the vast majority of people with positive LFD results can be confident that they have COVID-19.
follow this link for more information if required https://www.gov.uk/government/news/confirmatory-pcr-tests-to-be-temporarily-suspended-for-positive-lateral-flow-test-results