The point at which the heart sinks in this exhibition is, unfortunately, right at the outset. That’s where we meet the five commentators that the British Museum has invited to respond to the objects and ideas in the exhibition. But only Mary Beard knows her subject. There’s Bonnie Greer, playwright and critic; Elizabeth Day, podcaster and novelist; Rabia Siddique, humanitarian (that’s a calling, it seems) and barrister; and Deborah Frances-White, podcaster and stand-up comedian.