Test and Trace Currently Futile in the UK

There have been many mini-disasters in the UK's supposedly 'state of the art' Test and Trace programme. The latest is the loss (due to using an outdated piece of software to generate a spreadsheet) of almost 16,000 positive results for a Covid-19 infection, which mean't missing many thousands of connections. It's pretty obvious, however, that any test and trace programme is of no use, whatsoever, when three quarters of the English population fail to self-isolate, even when 'required' to do so (https://www.theguardian.com/world/2020/oct/09/covid-in-england-latest-figures-suggest). I am not certain whether this is down to substantial numbers of people not being in a position to self-isolate (they haven't got the facilities and/or they need to keep working to survive) and/or they simply choose to ignore what is required of them. Curtailing transmission of the Covid-19 virus is, however, impossible if only 25% of people, who have a positive contact, self-isolate. In order to work, self-isolation has to be as easy as possible, as well as becoming the only socially-acceptible choice. Neither of these are true at the moment.