This study investigates the relations, disputes and debates in the United Kingdom between left-wing (Labour), right-wing (Tories) and radical right (UKIP) parties during the Brexit referendum, between December 2015 and July 2016. Based on the reading of newspapers, articles on the internet, speeches, party manifestos and British laws, the work highlighted the centrality of the themes of immigration and the construction of national identities in the referendum. The study builds two main arguments. The first argument states that British parties did not act in isolation or autonomously, but constituted and responded to a general system of political action. This implies seeing the performance of the radical right as part of the party political actors who influenced each other mutually and permanently. The second argument argues that the voting marked the structuring of political spaces in the United Kingdom through two contradictory logics: complexification and simplification. On one hand, Brexit represented an excess of meaning, leading disputes to increasingly unlikely places. On the other hand, the ballot paper on June 23rd 2016 carried only two options: Leave or Remain, that is, leave or stay in the European Union. In this sense, the referendum announced a difficult promise, so that the discussions overflowed the very frame of the vote. Through a game between excess and lack, completeness and incompleteness, meaning and contradiction, the event functioned as a privileged space for political disputes for hegemony in building British national collectivity.