If the test is positive you need to quarantine for another 10 days. Count the 10 days starting from the day after you took the test, or from when you first had symptoms if that is earlier.
People you live with in the UK, or people you are staying with, should also quarantine for 10 days from the date of your positive test.
You do not need to take the corona virus test on or after day 8.
You may be contacted for contact tracing and to check that you, and those who you live or are travelling with, are self-isolating.
If the test result for Day 5 is negative you can stop quarantine as soon as you receive the result.
If the result from your test is inconclusive you must continue to quarantine. You can choose to take another privately provided test to find out if you can stop quarantine early.