"Loyal Enemies uncovers the history of the earliest British converts to Islam who lived their lives freely as Muslims on British soil, from the 1850s to the 1950s. Drawing on original archival research, it reveals that people from across the range of social classes defied convention by choosing Islam in this period." Haven't seen this yet.
Jamie Gilham, Loyal Enemies: British Converts to Islam, 1850-1950 (Hurst & Co):