Britain’s republican movement has revealed it plans to mount a campaign for a referendum on the future of the monarchy when the Queen dies. Republic has been nervous of appearing callous over the Queen’s mortality, because it sees the popularity of the Queen as crucial to public support for the institution. But on the eve of the Queen’s 90th birthday, Republic’s chief executive, Graham Smith, suggested that, when it happens, the Queen’s death will mark a turning point in public attitudes. “The Queen’s birthday reminds us that support for the monarchy is bound up with support for the Queen,” he...