In this paper architectural Modernism is used to describe the unadorned flat-roofed houses constructed using modern materials such as concrete, reinforced concrete and steel, and built mainly in the period following the First World War. This is a sparse definition that fails to do justice to the much broader interpretation of Modernism, which affected not only architecture, but all the arts in the first quarter of the twentieth century, a movement that reached maturity around 1930. However, even though the definition fails to reflect the richness of the Modernist idiom, the houses have long been recognised as representing Britain's first inroads into Modernist architecture as acknowledged by, for example, Gould, Bentley, Collins and Bettley.