MADRID | The Corner | After the biggest banking leak in history, British bank HSBC admitted on Sunday that its Swiss subsidiary systematically helped big fortunes dodge taxes and hide millions of dollars of assets. Switzerland and the whole industry are under the spotlight: long known for its banking secrecy, the country signed a fiscal transparency agreement with Brussels in 2004 which has proved insufficient. A new, enlarged version of the accord is being debated now and expected to be ready in 2018. But will it be enough? And what until then?