Political parties are in a unique situation, being able to change electoral rules and regulations to minimise any potential negative effects on their electoral prospects. Attempts to influence regulators, however, can be complex and include voicing concerns, public pressure and the regulatory capture of electoral regulators. Little is known about this relationship between parties and their regulators. This article focuses on this crucial electoral relationship through a study of political parties’ relations with the UK Electoral Commission. The first section addresses the background to the legal regulation of political parties. The second section proposes a framework through which parties’ reactions to regulation may be understood. The third part introduces the British case, providing evidence to demonstrate the broad utility of the framework. The final section analyses the issues that parties have raised with their regulators.