Having served as a member of the Humanities Research Board from 1995, in 1998 he was appointed chairman and chief executive of the newly established Arts and Humanities Research Board, "dashing around the country, successfully selling the idea that research in the arts and humanities should be as fully and imaginatively funded as research in the social or natural sciences."[3] He held this post until returning to Oxford to take up the rectorship of Lincoln College in 2000.
His notable publications include A Polite and Commercial People. England 1727-1783, the first volume to be published in the New Oxford History of England.[4]
P. Langford, The First Rockingham Administration, 1765–6 (Oxford, 1973)
P. Langford, The Excise Crisis: Society and Politics in the Age of Walpole (Oxford, 1975)
P. Langford, The Eighteenth Century, 1688–1815 (London, 1976)
P. Langford and W. B. Todd (eds.), The Writings and Speeches of Edmund Burke, vol. 2 “Party, Parliament, and the American War, 1766–1774.” (Oxford, 1981)
P. Langford, A Polite and Commercial People: England 1727–1783 (Oxford, 1989)
P. Langford, Public Life and the Propertied Englishman 1689–1798 (Oxford, 1991)
P. Langford, Eighteenth-Century Britain: a Very Short Introduction (Oxford, 2000)