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Is it Cherio, Joe? With speculation in the United States that the president could pull out of the presidential campaign as soon as this weekend, we ask a former aide to Kamala Harris, the vice president, about what a ticket led by her could be like.

Also on the programme:

As the world grapples with the effects of what's been called the worst IT outage ever - just how fragile is the fabric of our digital world?

A government advisor on why he's waging war on "ugly" phone boxes blighting Britain's streets.

And we speak to the 27-year-old musician who wrote the video game-inspired composition which premiered at this evening's First Night of the Proms.