England's car plants, railways, supermarkets, and pubs warned the government on Monday that a Covid-19 tracing app, which has told hundreds of thousands of workers to isolate, was wrecking recovery and pushing supply chains to the brink of collapse.

Cases of Covid-19 in Britain hit around 50,000 a day on some days last week.

Alerts, or "pings", sent out by the official app telling anyone identified as a...