Many publications collected in Essays in Anglo-Saxon History (1986), and The Anglo-Saxon State (2000). Other publications include ‘England, Scotland & the Hundred Years War in the14th century’, in J. Hale, R. Highfield & B. Smalley (eds), Europe in the Late Middle Ages (1965); ‘Norwich’, in M.D. Lobel (ed.), Atlas of Historical Towns: Volume 2 (1975); (as editor & contributor), The Anglo-Saxons (1982); ‘Anglo-Saxon courts’, in C. Cubitt, Court Culture in the Early Middle Ages (2003); ‘Hundreds & leets: a survey with suggestions’, in C. Harper-Bill (ed.), Medieval East Anglia (2005); ‘Archipelagic thoughts: comparing early medieval polities in Britain & Ireland’, in S. Baxter et al. (eds), Early Medieval Studies in Memory of Patrick Wormald (2009); ‘Questioning Bede’, in M. Henig & N. Ramsey, Intersections: The Archaeology and History of Christianity in England (2010).

Research interests include Anglo-Saxon England & the history of the state.