"No-one expected as unequivocal a ruling as this": Ireland has prevailed in its case against the EU Commission, who claimed that billions in corporation tax were owed by Apple to the Irish exchequer due to its operations here. Europe's second highest court decided that none of the money was taxable here. But why was the case taken in the first place, and what will the EU's next move be in its attempts to shut down tax avoidance? Joe Brennan and Cliff Taylor explain.