This document provides an analysis of the potential upcoming EU referendum in the UK. It begins by looking at historical public opinion trends on EU membership. It then examines the current state of play in polls, finding that a slim majority currently support remaining in the EU. The document notes that question wording can impact results and draws lessons from previous Scottish and UK referendums. It analyzes the political context around issues like trust in politicians, UKIP support, and attitudes toward the EU. Finally, it considers factors that may be important in the referendum campaign such as messaging, immigration, sovereignty, uncertainty, jobs and the economy, spokespeople, targeting key demographics, and maintaining momentum.