Whilst I entirely agree that the govt has been absolutely crap there are also problems with the alternative app which apparently has problems checking distances phones are apart.
Frankly I am not sure how Cummings comes into this. I believe that the only data you input into the app first is the 1st part of a postcode. You then report symptoms if you get them so anyone in close contact with your phone with the app is wwarned to isolate. You can then ask to be tested via...