In U-turn, Boris Johnson to quarantine after Covid contact

Boris Johnson's 10 Downing Street office said on Sunday that the Prime Minister and treasury chief Rishi Sunak were both alerted overnight by England's test-and-trace phone app. People who are notified through the app are supposed to self-isolate, though it is not a legal requirement. Contacts of positive cases usually are advised to self-isolate for 10 days.