A national vote on U.K. membership in the European Union will be held by 2017.<br />It's the first time in 40 years the issue has been put to the test, and the country is deeply divided.<br />Supporters of Europe say membership brings significant economic gains - worth as much as £78 billion a year, according to the Confederation of British Industry.<br />Opponents argue the costs outweigh the benefits, and say Britain needs to reclaim the power to determine its future.<br />Prime Minister David Cameron has said he is ready to campaign in favor of continued membership, provided the EU is willing to change.<br />On Tuesday, he revealed his wish list of reforms.<br />Bringing down net immigration is one of Cameron's top priorities.<br />The country has experienced a huge influx of workers from eastern Europe in the past decade.
