A problem in the design of the NHS Covid-19 app means people could be told to self-isolate unnecessarily.
The app includes the option to scan QR codes at venues such as restaurants, shops and places of worship. If someone then tests positive after visiting that place, those who also scanned the QR code will be told they may be at risk and given advice.
But the app does not let those people check out of the location again. That means they may be told to self-isolate on the basis of having checked in at a hotspot location — despite having left long before the person who tested positive arrived.
‘The app registers what time you enter a venue but does not register what time you leave’