Diamond talked the situation through with Jennifer, his wife of 26 years. “What is the best thing right now I can do for the firm?” he asked. His answer: “Step aside and shut up.” His daughter, Nell, a recent graduate of Princeton, wasn’t quite so discreet. The morning after Diamond announced his resignation, she tweeted: “George Osborne and Ed Miliband you can go ahead and #HMD” — referring to a slang term that can’t be reprinted in these pages. (Google it.) She immediately called her father.

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