This article explores relationships of solidarity constructed between London and the British coalfields from 1968 until the 1984–1985 miners’ strike. Foregrounding the development of a culture of solidarity over this period resituates the support movement during the 1984–1985 strike as embedded in longer‐term relationships, which suggests a more equal relationship between coalfield and metropolitan activists than is given by focusing narrowly on the year itself. I argue that a spatially and temporally dynamic sense of the development of these relationships allows us to better grasp the potentially mutual nature of solidarity. Thinking about the construction of this culture of solidarity can contribute significantly to understanding the nature of labour agency. I emphasise the generative nature of solidarity, particularly the ways in which the spatial and social boundaries of the labour movement were challenged through solidarity relationships, allowing in some instances a more diverse conception of working‐class politics.