Aficionados of Clark infidelities will relish such morsels as the tale of his paying off a threatening ex-mistress for £5,000. The diarist's scorn for the girl in the case seems to have been increased when he found that she could be dismissed so cheaply. There is lots of pitterpatter about expensive cars, meals, holidays, and of course a deluge of withering comments about colleagues. The weight of words devoted to the state of his own body argues a high narcissism. But he had no access to the corridors of power. He was merely an outsider occasionally peering hungrily into the Whitehall tent. His narrative tells us a lot about the boredom and frustration of being a backbench MP, but if we know these things already, precious little about government in general or that of Thatcher in particular. So beyond a certain point, why go on reading? Harold Nicolson's diaries are superb, because not only did he write wonderfully, his judgments on people were often very shrewd. Clark, like Chips Channon, possesses the narrative gift, but his judgment was dreadful, on small things as in great.