Re: In the interim, the British government has been forced to adopt human-powered contact tracing
That was always part of the plan. Some people don't have smart phones. Some of those that do, won't install the app. The app was never more than an adjunct to manual contact tracing. At best it helps with situations where the infected person doesn't know all the people they've been in contact with. For example, if they sat on public transport next to a stranger for 20 minutes without exchanging phone numbers. Neither the app, nor manual tracing, can be expected to give perfect track and trace.