Coronavirus: UK to have 'world-beating' tracing system
Boris Johnson said 25,000 contact tracers, able to track 10,000 new cases a day, would be in place by 1 June.
The comment came as a response to Labour leader Sir Keir Starmer, who challenged the PM over the absence of a tracing system since March.
Read more: UK track and trace system in place from June - PM