It is "probably the most important reform" welfare system in the country "since the Second World War," said the Institute for Economic Studies (IFS), British independent research center. <br> The goal is to save 21 billion euros by 2015, "the largest spending cuts in history" of the welfare state in the UK, says the IFS. <br> <br> This overhaul, which began in 2010 but significant measures come into force as of April 2013 until 2017, is part of the policy of reducing the public deficit of the government. It also aims to simplify a highly complex system fifty allowances. <br> It must also provide "justice" in the heart of the welfare state, insists the Conservative Prime Minister David Cameron, denouncing the that living on welfare had become a "lifestyle choice."