Wales Says Yes provides the definitive account and analysis of the March 2011 Welsh referendum. Drawing on extensive historical research, the book explains the background to the referendum, why it was held, and what was at stake. The book also explains how the rival Yes and No campaigns emerged, and the varying degree of success with which they functioned. Through a detailed account of the results, and analysis of survey evidence on Welsh voters, the book explains why Wales voted Yes in March 2011. Finally, it considers what that result may mean for the future of both Wales and the UK.