Back in March there was an element of contact tracing, done by personal contact with people known to the patient.
This was knocked on the head by the powers that be as being too time consuming. However, had it continued, with volunteers it could have been successful.
Each hospital could have enrolled a local organisation, maybe WI or Round Table to do this, by giving them the contact details of a patient's next of kin.
I'm sure that there would have been thousands of volunteers all over the country willing to take part. But instead, we now have a telephone app, produced by a company owned by Cummings brother to deal with it.
We've all seen the diagrams of how one person with covid can indirectly pass the disease on to hundreds. Had this type of contact tracing stayed in place we might have seen fewer deaths.