In any case a quick google reveals hundreds of articles about the UK’s initial strategy of which this is one.
Yes, but the expert writing in your Guardian link (15th March) says the UK should copy South Korea instead;
"You should instead look to the example of South Korea, which, through a combination of intense surveillance and social distancing, appears to have gained some semblance of control over the virus."
This BBC article written 10 days earlier describes this intense surveillance in detail:
"As I sit at home, my phone beeps alarmingly with emergency alerts."
""A 43-year-old man, resident of Nowon district, tested positive for coronavirus," it says."
"He was at his work in Mapo district attending a sexual harassment class. He contracted the virus from the instructor of the class."
"A series of alerts then chronicle where the men had been, including a bar in the area until 11:03 at night."
"These alerts arrive all day, every day, telling you where an infected person has been - and when. You can also look up the information on the Ministry of Health and Welfare website."
"No names or addresses are given, but some people are still managing to connect the dots and identify people.The public has even decided two of the infected were having an affair."
"And, even if patients are not outright identified, they're facing judgement-or ridicule-online."
"When you search online for a virus patient's case number, related queries include "personal details", "face", "photo", "family" - or even "adultery".
"Some online users are commenting that "I had no idea so many people go to love motels" - the by-the-hour hotels popular with couples."
"One recent alert concerned a woman, aged 27, who works at the Samsung plant in Gumi. It said that at 11:30 at night on 18 February she visited her friend, who had attended the gathering of religious sect Shincheonji, the single biggest source of infections in the country."
"City mayor Jang Se-yong further revealed her surname on Facebook. Panicked Gumi residents commented on his post: "Tell us the name of her apartment building." ...
"Please do not spread my personal information," the woman later wrote on Facebook."
"I am so sorry for my family and friends who would get hurt, and it's too hard for me psychologically, more than (physical pain)." ...
"Goh Jae-young, an official at the Korea Centers for Disease Control Prevention, told BBC Korean."
"At first we interview the patients and try to gather information, emphasising that this affects the health and safety of the entire people."
"Then to fill in the areas they perhaps haven't told us, and also to verify, we use GPS data, surveillance camera footage, and credit card transactions to recreate their route a day before their symptoms showed."
Sorry, but how exactly is the UK going to implement this strategy?
www.bbc.co.uk/news/world-asia-51733145