SWMBO and I signed up for a Kings College app ages ago (called Covid-19) on which we report daily, even though if no symptoms. It takes seconds. She had the trots reasonably mildly on Sun and Mon which she reported. She has been told to go for a test, which was booked last night at a drive-thru for 10:15 today - so no shortage here apparently (Berkshire).
(I think it is extremely unlikely she has it, as other than walks in the country she hasn't been anywhere. Their email says they are recommending the test as their app is trying to identify indicators so they really want to know whether having the runs (and nothing else) could be a sign.)
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