The tale of Alok Sharma will 'have legs' (as they say) if he is confirmed as positive.

If Parliamentarians do not self-isolate after contact with him, it will be the 'one rule for us and one for you' all over again.   If they do, it will once again call the reopening into question - in fact, it could even be necessary to close it again. Then there is the fact that all the MPs are now traipsing back back to their constituencies, potentially carrying the infection, which will also question the 'travel as far as you like for work and exercise' decisions.

Then there is the effectiveness of 'track and trace' with him as a test case.

Moreover, because he was ill so publicly, it cannot be hushed up as some other cases have been. All in all, if he does test positive, yet another headache for the government.

And, given how visible and relatively sudden the symptoms were, if he does not test positive there might be questions about whether the tests are reliable.