CONFLICT, DIASPORA AND EMPIRE:IRISH NATIONALISM IN BRITAIN, 1912–1922. By Darragh Gannon. Cambridge: Cambridge University Press. 2022. Pp 304. £85. Darragh Gannon’s new work on Irish nationalism in Britain during the revolutionary decade is both influenced by and contributes to two recent historiographical trends in exploring the significance of the revolution beyond Irish shores and of the Irish emigrant experience in Britain more widely. This work complements Gannon’s existing contributions to our under- standing of the global revolution, including his article in a recent special edition of this jour- nal dedicated to that subject. This new book cements his reputation as an authority on the significance of Irish revolutionary movements and their impact outside Ireland. The choice of date span is crucial to the success of the book as it covers both constitutional and revolutionary nationalism and straddles the First World War, the experience of which by the Irish diaspora in Britain is shown to have had a significant impact on how that cohort responded to the emergence of revolutionary fervour in Ireland from the mid-point of the war in 1916. With 150,000 British-based Irish in the trenches by 1915, the prospect of con- scription posed a delicate challenge for Irish nationalists in opposing its extension to Ireland while living with its reality in Britain. This discussion of the Irish in Britain as ‘ethnically conscientious objectors’ (p. 115) contributes not just to the understanding of Irish opposition to conscription (which became more focused in Ireland in 1918) but adds a dimension to domestic opposition within Britain that is not adequately recognised by those studying con- scientious objection from a British perspective. Personalities loom large in this work and two about whom we learn more are T. P. O’Connor, the only British-based Irish Parliamentary Party (I.P.P.) M.P. and Art Ó Briain of the Irish Self-Determination League (I.S.D.L.). O’Connor was central to the extent of home rule activism in the pre-1914 period, and the book details the prevalence of both pro- and anti-home rule demonstrations in Britain in the years of the Ulster crisis. While the focus here is on nationalism, the examination of anti-home rule demonstrations and the spread of Ulster Volunteer Force companies throughout Britain in 1913 and 1914 suggests scope for a study mirroring aspects of Irish or Ulster unionist opinion and organisation in Britain during these years. Not surprisingly, O’Connor fades from the narrative after 1918 as Ó Briain, the subject of a recent biographical study by Mary MacDiarmada, comes to the fore in a reflection of the replacement of constitutional by revolutionary nationalism, similar to what was happening in nationalist politics in Ireland. The I.S.D.L.’s activities in Britain were similar to those of Sinn Féin in Ireland and are explored in detail here — fundraising, prisoner welfare (given how many Irish republican prisoners were serving their sentences in British prisons) and, cru- cially, cultural activities, as cultural nationalism is shownto have been central to advanced Irish nationalism in Britain. While this dynamic of the replacement of constitutional with advanced nationalism reflected the process playing out simultaneously in Ireland, Gannon shows how events spe- cific to the domestic context in Britain were also a factor in the decline there of the Irish Party and its grassroots organisation, the United Irish League of Great Britain. In particular, he notes the significance of the extension of the franchise in 1918 under the Representation of the People Act. The larger electorate, the demise of the I.P.P. and the diffusion within British party politics with the post-war rise of Labour all contributed to the dilution of a dis- tinctive Irish vote within the British electorate. The two final chapters — dealing respectively with politics and Irish Republican Army (I.R.A.) activity during the War of Independence — account for a sizable portion of the book and make a sound case for Great Britain constituting an additional theatre in that con- flict. There is an impressive level of detail on the political and militant actions of Irish revo- lutionaries, and the significance of the Military Service Pensions Collection, especially for chapter five on ‘Arms, conflict and post-war violence’, as a source, which has over the past decade allowed fora much greater understanding of such activity, is very clear. On the political front, while the War of Independence was underway in Ireland, republi- cans in Britain were supporting hunger-striking Irish prisoners in British jails, raising Irish Historical Studies 196 https://doi.org/10.1017/ihs.2024.13 Published online by Cambridge University Press