In the past week, many people have been 'pinged' by the NHS app, informing them they have been in close contact with someone who has had the Covid-19 virus and that they should self-isolate. However, despite this advice there is no legal obligation.
Downing street, on the other hand, have urged those who have been 'pinged' to self-isolate when sent the alert via the app.
A spokeswoman for No 10 has said "Given the risk of having and spreading the virus when people have been in contact with someone with Covid, it is crucial people isolate when they are told to do so, either by NHS Test and Trace or by the NHS Covid app".
Source. BBC News, 20 July 2021