Seven Ages of Britain began in the same week as A History of the World in 100 Objects on Radio 4. You wait a prodigiously long time for a massive cultural overview and then two come along at once. Do they think in a joined-up way about these things at the BBC? Or has this double helping been a sign of a wider moral and structural chaos that characterises the new world disorder? Last night David Dimbleby concluded his tour of two millennia of British art. It has, inevitably, been a bit of a sprint. In this final episode, the horror of the trenches was wrapped up in less screen time than it took to show Tracey Emin’s new line animation of a woman, legs splayed and frenetically wanking. Chaos? I think so.