In U-turn, Boris Johnson to quarantine after Covid contact July 18, 2021 at 01:15AM

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.