Can No. 10 stem the 'pingdemic'?

Today the CBI gave a stern warning that the test and trace app is 'closing down the economy'. Despite this, the government's key workers list - promised on Monday - has still not been released. What's the hold up, and what will this mean for Boris Johnson's summer as MPs head home for recess? Cindy Yu talks to Katy Balls and James Forsyth.