What is the UK workplace contact-tracing pilot scheme causing a political row?

On Sunday, Downing Street announced that British prime minister Boris Johnson and Chancellor Rishi Sunak had been contacted by NHS Test and Trace, but would not be isolating as they were taking part in the pilot.

A message to self-isolate (Yui Mok/PA)

A pilot scheme which allows contacts of people testing positive for coronavirus to carry out essential activities and not self-isolate has been the centre of a furious political row on Sunday.

Here we look at the scheme hoping to help avert the so-called “pingdemic.”