That's not correct. https://www.gov.uk/guidance/coronavirus-covid-19-information-for-the-public#diagnosis-and-analysis
I had to clear my cache to see that. Lucky I came back on the 8th then!
It's interesting what you should do, the advice changed as of the 9th, maybe those who aren't beyond 14 days should isolate for that period. Someone at work has taken this approach.
Edit; looks like the Gov site has clarified the point.
@Tenderloin started
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That's not correct.
https://www.gov.uk/guidance/coronavirus-covid-19-information-for-the-public#diagnosis-and-analysis