July 21, 2021 LONDON: Downing Street has moved to combat confusion over how people should respond if “pinged” as a contact by the NHS Covid-19 app. Number 10 said it was “crucial” for people to quarantine in line with the app’s recommendation, just hours after a government minister suggested people should make an “informed decision” about whether to obey the technology. Business minister Paul Scully said self-isolating after being told to by the app was a decision for individuals and employers. Another minister in the business department, Lord Grimstone of Boscobel, stressed in a letter to one large employer that the app was only an “advisory tool” and that people were not under any “legal duty”, The Times reported.