This chapter provides an overview of the international concrete poetry movement of the 1950s-70s, which frames the development of concrete poetry in England and Scotland. Concrete poetry first emerged in West Germany and Brazil in the early-to-mid 1950s, largely through the endeavours of Eugen Gomringer and the Noigandres poetry group. The earliest concrete poetry, defined in this text as ‘classical concrete’, was rooted in the aesthetics of constructivism, concrete art, modernist architecture, and literary modernism, as well as an interest in simplifying and clarifying language systems which was often connected to semiotics, especially information theory. A key impulse was the desire to develop transnational systems of linguistic communication, as the basis for post-war international dialogue. By the close of the 1960s, however, a different definition of concrete poetry, more connected to Dada, Futurism, and intermedia art, had taken hold worldwide. This variant of concrete was associated with the sixties counter-culture, and with a desire to tear down existing social institutions, expressed through non-linguistic or anti-linguistic impulses. To some extent this global narrative mirrors the story of concrete poetry’s development in England and Scotland, and can be traced by assessing the work of Finlay, Morgan, Houédard and Cobbing in turn.