This article focuses on discourses on populism, presenting a case study on the United Kingdom. Analysing all references to populism in the British Parliament from 1970 to 2018, this article provides a framework to think about rhetoric and populism, a method to investigate political attitudes, and insights about the debate on populism in the United Kingdom. Results show that from the 1970s to the 1990s politicians interpret populism in demagogical terms and most often refer to the category of the political role of ‘the people’. More recently, negative references and personal attacks increase, and politicians refer to different categories. Moreover, the analysis shows how British politicians employ epideictic and forensic rhetorical strategies more often when debating about populism, whereas deliberative strategies rarely emerge. Finally, the investigation over the 2015–2018 period shows that government membership, a distant election, and a right-wing party membership increase the likelihood of rhetorical positive interpretations of populism.