https://www.theguardian.com/world/2020/oct/17/police-get-access-to-people-told-of-self-isolate-by-nhs-test-and-trace

Fears move may deter people from getting tested for Covid-19 if forces get data

People who have been told to self-isolate through NHS test and trace could have their contact details passed to police, a move some fear could deter people from being tested for coronavirus.