"In-or-Out Vote Set for June 23 'Should the United Kingdom remain a member of the European Union?' On June 23, 2016, British voters are expected to answer this question. Prime Minister David Cameron set the referendum date on February 20 after completing months of negotiations with his fellow European Union (EU) leaders about securing a 'special status' in the EU for the United Kingdom (UK)."
CRS Insight, IN10449
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html