Seems an awful lot of time and effort is being put into something that (IMO) isn't going to be any better than the current 'self isolation' procedure already in place.
Currently, if you think you have the symptoms you self isolate (and hopefully contact people you've been around)
With the app (from what I can see), you have to correctly and accurately input your symptoms then wait for a test kit. When the test is identified as positive, your phone tells everyone you have it . . . if everyone has the app running constantly.
It all seems very hit & miss to me, like buying something cheap off Ebay and hoping it works when it arrives
