Sorry flapping may have been a bad word. I know it's easy to get worried when there is little information out there.
I have no particular access to any special knowledge, other than I did some fairly extensive reading on the SK track and trace in the early days back in March. I can't see why we deviate greatly from that to be honest and that seems to be the case from what I have been able to gather fro. The information released so far. If anything this will be less intrusive than SK. (and therefore less effective, although you have the laws of diminishing returns - see also Spanish 'proper' lockdown)
Basically the system is really only effective when you have very few cases cropping up. SK had developed the system for their SARS out break a few years ago.
The most effective countries at controlling the early days of the outbreak seemed to generally have two things: co-ordinated testing and localised lock downs. (Germany also started with state based lockdown, but they have a very different political structure to us that allows this)
Both of those are only effective when numbers are low. Its therefore fairly heartening that the UK is reaching the point where these are beneficial and also willing to put this in place.
The devil will be in the detail of course and being British the application of these might be a little bit shit as there are some legasltive and social issues here that would prevent the exact implementations of the schemes.
You may get Malicious reports, however the questions could be detailed enough (and flipped) to reduce that possibility. Few people are that good at lying on the spot.
If it was me I would have a risk matrix setup for stories not tallying and other variables such as age etc. But that maybe too forward thinking and nuanced for this government.