How to write about the many, diverse places that constituted the British Empire in the same text; how to conceive of both the differences and the connections between Britain and its various colonies? These have been perennial problems for imperial historians. This article begins by examining the concept of 'core' and 'periphery', and the various ways that it has been employed within the tradition of British imperial history. It then turns to concepts such as networks, webs and circuits, which are characteristic of the 'new' imperial history. It suggests that these newer concepts are useful in allowing the social and cultural, as well as the economic, histories of Britain and its colonies to be conceived as more fluidly and reciprocally interrelated. The article concludes by suggesting that these spatial concepts could usefully be taken further, through an explicit recognition of the multiple trajectories that define any space and place.From the beginnings of British imperial history writing at the end of the nineteenth century, the differences between spaces and places, particularly 'metropolitan' or 'core' ones, and 'colonial' or 'peripheral' ones, have been absolutely fundamental to our imagination of the British Empire. And yet these spatial concepts have rarely been examined explicitly. Rather, the spatial imagination of imperial historians has generally been an implicit, taken-for-granted one. This article begins by reviewing a genre of 'traditional' imperial history that is often criticized by postcolonial scholars for being top-down, focused solely on economic and political issues, and not only masculinist but also ignorant of the significance of gender in its approaches. Seldom, however, has that tradition been interrogated specifically for its spatial imagination. At the risk of re-centring a tradition that many postcolonial scholars of empire have been seeking to displace, this article begins by performing such an interrogation. It does so, however, as a stepping stone to newer ways of conceptualizing the British Empire's spatialitiesways that postcolonial scholars themselves have developed.For over thirty years, between the 1950s and 1980s, the most influential model for understanding Britain's nineteenth-century imperial expansion was that of Ronald Robinson and John Gallagher. Robinson and Gallagher argued that the kind of overseas influence favoured by the mid-Victorian