Dozens of Union Jacks are decorating central London these days. They hang, for example, from the lampposts of The Mall, the avenue between Buckingham Palace and Trafalgar Square, the traditional epicenter of British monarchy celebrations: weddings, burials and coronations. They've been dusted off—a figure of speech, because any baggage or state visit is used to show them off—since the last major event took place just two years ago: the ride in the golden carriage of Charles III and Camila, to commemorate the enthronement of Elizabeth II's eternal crown prince.