Between 1640 and 1660 the British Isles witnessed a power struggle between king and parliament of a scale and intensity never witnessed, either before or since. Although often characterised as a straight fight between royalists and parliamentarians, recent scholarship has highlighted the complex and fluid nature of the conflict, showing how it was waged on a variety of fronts, military, political, cultural and religious, at local, national and international levels. In a melting pot of competing loyalties, shifting allegiances and varying military fortunes, it is hardly surprising that agents,...