UK NHS working with Apple-Google on COVID-19 contract tracing app

In the UK, senior sources say NHSX, the NHS’ technology arm, has been working at “breakneck speed” on a COVID-19 contract tracing app with Google and Apple. The app will use Bluetooth to alert users if they have been in close proximity with someone who has tested positive for COVID-19.
How the proposed system is designed to work:Click for larger view (Source: Apple and Google)
Tim Shipman and Nick Rufford for The Sunday Times:Combined with a vast expansion in testing, which min