Voting is underway in Catalonia’s informal referendum on a breakaway from Spain.<br /><br /> Hundreds of thousands of people are expected to back independence in a so-called “consultation of citizens” which is not legally binding.<br /><br /> Authorities in the northeastern region opted to hold the symbolic poll after plans for a more formal vote were blocked by Spain’s Constitutional Court.<br /><br /> Madrid says the vote carries no weight; Catalan nationalists insist it can’t be ignored.