Chatterjee believes that “the widespread adoption of screens into our children’s lives is the most urgent public health issue of our time”. He was never very political, he says. He is the affable host of a successful health podcast, Feel Better, Live More, and his books strike an optimistic, inspiring tone – but on this issue he is passionate, his frustration obvious. “I think successive governments have been very weak here, and they are failing a whole generation of children. I think they’ve already failed a generation of children.”