Volumes 40 and 41 together contain 375 charters and letters from bishops of Norwich in the thirteenth century. There is a substantial introduction to the bishops and the background to the documents and scholarly notes. The volumes complete the diocese of Norwich as part of the English Episcopal Acta project.

Fellow of Royal Historical Society and of Society of Antiquaries. Successively lecturer, Senior Lecturer and Professor, St Mary's College, Strawberry Hill, 1973-97; Professor of Medieval History, UEA Norwich, 1997-2010; Emeritus Professor and professorial research associate, 2010-present