A public health expert has warned it would “probably be very unwise” for Scotland to follow England in lifting the self-isolation requirement if they test positive for covid.Prime Minister Boris Johnson on Wednesday announced his intention to scrap the legal duty this month, as long as “encouraging trends” in the data continue.Professor Andrew Watterson said the move south of the border is a “leap in the dark” and creating confusion.Current self-isolation regulations in England expire on March 24 but Johnson said expects to end the last domestic restrictions – including the requirement to self-isolate if you test positive – a full month early.At the beginning of Prime Minister’s Questions yesterday, the Tory leader brought cheers from his backbenchers with plans to end self-isolation for people who test positive for coronavirus “a full month earlier” than planned. To sign up to the Daily Record Politics newsletter, click here. Police investigating the lockdown parties in Downing Street are contacting more than 50 people who attended and asking them to give an account of their presence.Boris Johnson and his wife Carrie are thought to be among those who have been given seven days to give an honest explanation to the police about the rule-breaking parties.The Metropolitan Police said the inquiry named Operation Hillman would be sending notices asking for “an account and explanation of the recipient’s participation in an event”.Read More: Police partygate investigation questions more than 50 Downing Street party attendeesProf Watterson told BBC Radio Scotland's Good Morning Scotland programme: "It's almost a big bang approach by the UK Government, a leap in the dark."It's not measured in terms of gradually relaxing the