This chapter explains the significance of a comprehensive and in-depth historical study of the critical role played by the Conservative Government’s whipping operation in securing the UK’s membership of the European Community (EC)—the forerunner of the EU. It makes the case for revisiting and reassessing the parliamentary battle for entry by focusing on the relationship between the whips and the original Conservative eurosceptics (anti-Marketeers). The chapter introduces the key themes related to the whipping operation, overseen by the Government’s Chief Whip, Francis Pym; these include the tension between individual conscience and party loyalty. It discusses the academic literature relating to party management during the battle for entry and locates it within the wider context of competing traditionalist and revisionist perspectives on whipping. The chapter also examines the central concept of ‘loyal dissent’, including its relevance to the management of eurosceptic dissent during the process of entry, with comparisons drawn to the later Maastricht rebellions of the 1990s. It concludes by considering the secrecy that surrounds whips and whipping, and how a historical case study can provide an effective research method, enhancing our understanding of party management methods and the nature of the British parliamentary whipping system.