The U.K. wanted to make an app to trace coronavirus infections and had been testing on out on the Isle of Wight this spring. But going on its own, the government admitted that it would take way too long to publish and opted instead to adopt tracking APIs created jointly by Apple and Google. Now, the rewound NHS COVID-19 app is out for trials.
The UK's national health service (NHS) started testing its coronavirus track and trace app with a limited group of users on the Isle of Wight on May 5, but the UK government has been very quiet about it since then. It now appears that the app is available to Android users on the UK mainland — I can vouch for this myself since I live in London — and even outside the UK for some reason, so we can hopefully expect official word that it's available to all soon.