Sir Martin Sorrell has seen off another rebellion over pay after 22% of shareholders failed to back his GBP43 million package in what has become an annual City ritual. However, he may have a harder time fending off questions about how his company is planning for when he eventually retires from the world's biggest advertising group. Standard Life, one of the City's top fund managers, made a rare, public intervention by claiming that WPP's board must "confront the succession elephant."”.