At the beginning of the twentieth century, for many English men and women of Welsh origin the idea of being in some part ‘Welsh’ reaffirmed their own understanding of what it meant to ‘be British’. Wales in England, 1914-1945 is the first cultural history of this English Welsh duality – an identification with two constituent nations at once – and explores how ‘Welshness’ was imagined, performed, and mobilised in England during and between the two world wars. In so doing, and making use of individual English Welsh case studies from the worlds of politics, art, literature, and soldiering, the book provides a wholly new perspective on the social, cultural, and military history of Britain at war. It shows English-Welsh duality to have been an important strand of pluralistic Britishness in wartime, and that this diasporic construction of Welshness held a wide urban appeal with significant implications for military enlistment, cultural production, and commemorative practices in England. Working at the intersection of war studies, British studies, and diaspora studies, Wales in England makes a significant contribution to ‘four nations’ history and the history of British society at war.