Anyone coming into close contact with infected people in England will be told to isolate.
The PM rules out an inquiry into the conduct of his top aide at the height of the coronavirus lockdown.
Schools minister challenged by MPs over whether all primary years in England will go back next month.
Rob Roberts says he was in London but his family "had been reminded" of the government's lockdown rules.
The number of people dying with coronavirus in Scotland has fallen for a fourth consecutive week.