Historian, activist and campaigner Edward Thompson is seen as an exemplar of an English radicalism which some see as a lineage with which the contemporary Labour party might fruitfully reconnect. This article examines how Thompson himself understood and characterised the ‘English radical idiom’ and traces his use and then abandonment of this idea in the middle years of his career. It offers some wider reflections about what the insights and lessons associated with his historical writings and reflections on the distinctive nature of English cultural and social thought.