* The Last Elizabethan: The Life of Robert Sidney, 1563–1626 (1994)
* Oxford and the Grounds of Belief (1996)
* Life and Opinions of Arminius (2003)
* Edmund Campion and the English Jesuits (2003)
* The Rule of Law: An Illustrated Guide (2010)
* The Oxford Handbook of British Politics and Political Science (2014)
* The British Academy Centenary History of the Social Sciences (2021)
Fiction:
* In Transit: A Novella and Short Stories (2019)
* The Death of Socrates: A Play in Three Acts (2020)