Exploring how the transformative intentions within the mandated citizenship curriculum framework for English schools demand a particular kind of citizenship teacher - one who 'acts against the grain' of the inequities and injustices of the social world - this paper presents Mr C's story. Mr C is a secondary teacher at an Upper School located north of London. The paper considers the significance of his philosophies and knowledge in enabling practice aimed at developing students' socially inclusive but critical understandings of diversity and difference. Mr C's well-defined personal philosophies about justice and the 'common good' and his capacity to translate these philosophies into practice are presented as central to mobilising the transformative or 'maximal' intentions of the citizenship curriculum. In highlighting the complexities and sophistication in Mr C's approach, however, the issues presented in this paper further strengthen the critique regarding the curriculum's depoliticised approach. While Mr C draws on the curriculum as a political device to support equity goals, it cannot be assumed that citizenship teachers more generally will have the requisite philosophies and knowledge necessary to do so.