https://www.theguardian.com/world/2020/oct/13/uks-test-and-trace-having-marginal-impact-which-countries-got-it-right

Scientists’ verdict on £12bn system has refocused attention on what is working elsewhere in cutting Covid-19 transmission rates

The newly released assessment by the UK government’s scientific advisers that the £12bn test and trace programme “is having a marginal impact” in reducing Covid-19 transmission has refocused attention on how other countries are faring with their regimes.