Question to the Department of Health and Social Care:

To ask the Secretary of State for Health and Social Care, what (a) distance away from and (b) length of time spent near another app user will the covid-19 tracing app be set to report a potential covid-19 interaction.

The decision of precisely which other app users are notified if you notify the app you have become unwell with symptoms of COVID-19 will be determined by a sophisticated ‘contact risk model’. National Health Service doctors and scientists will continuously update this ‘contact risk model’ to make it as accurate as possible. The model will be based on scientific principles and it will be approved by the Chief Medical Officer.