Coronavirus

[TheGrump]

This is rather an alarming statement from TheGump's link posted above...

If the NHS later discovers that your diagnosis was wrong (and your reported symptoms are not coronavirus), the other users will receive another alert, letting them know if they can stop self-isolating.

Which would seem to indicate that the NHS are not exactly awash with confidence over test results...!

Another quote taken out of context.
Where does the full statement explicitly mention a test?
It is primarily about self diagnosis.