Good and bad
"In a decidedly low-tech scheme, the plan is for those testing positive for COVID-19 to get phone calls from NHS tracers, who will ask them who they have been in contact with [GOOD]. Any of those contacts deemed to be at risk will be advised to self-isolate for 14 days even if they are not ill [BAD]"
IMHO, the basic contact tracing is a good thing. Normally done face to face (or mask to mask) to emphasize the gravity of the situation. A phone call is weaker, but its still contact tracing.
But you don't call those contacts and ask then to self isolate for 14 days. You slap them with a mandatory mask wearing "a mask is on its way, wear it":, and mandatory test order "GO GET TESTED HERE AT X TIME T", and orders with clear cut rules they *have* to follow. They're not the experts in disease control, you are, *you* dictate to *them* the quarantine rules they are *required* to follow so its crystal clear the gravity of the situation. If they test positive quarantine their ass too.
I assume you mandatory quarantine the infected person? Otherwise its just people talking on phones.
You stick them in a quarantine center, with clear orders and food and tv? In Thailand these are nice >3 star hotels they've taken over, the person has to stay in their rooms, but food towels and linen are delivered. The quarantined person complains about too much plastic food boxes spoiling the environment. which shows you the low level of complaints. "Ooo the sushi I got today didn't have the proper fatty tuna, only regular tuna" blah blah blah.
You understand why I have zero doubts about going out to a restaurant in Thailand now. I'm even booking my trips for the year. Confident in the handling of the virus. Not some sort of vague fluffy 'advice'. I know that if a person is infected, they are in quarantine, and their contacts are being tested and quarantined as needed.
You're the leader Boris, so lead. Don't take shit from the back benchers, fix it, clear the virus, end it, move on with confidence. Thatcher not Major.