Hope everyone is bearing up and staying well.
I was listening to Radio 4 this morning. Scientist was on talking about a study to help identify/clarify early significant symptoms and clusters of new cases early.
This is NOT a person specific contact tracing/alerting app as has been discussed in the media before but effectively a mass epidemiological data collecting and rapid analysis scientific study. It is 'citizen science'. You report how you are feeling physically each day, even if well. It potentially will give better data on the various possible symptoms of COVID-19, identify those that might give early warning and possibly indicate developing clusters of disease at an early stage.