Edmund Hammond (1854-1873)
Lord Tenterden (1873-1882)
Sir Julian Pauncefote (1882-1889)
Sir Philip Currie (1889-1893)
Sir Thomas Sanderson (1894-1906)
Sir Charles Hardinge (I) (1906-1910)
Sir Arthur Nicolson (1906-1916)
Sir Charles Hardinge (II) (1916-1920)
Sir Eyre Crowe (1920-1925)
Sir William Tyrrell (1925-1928) and Sir Ronald Lindsay (1928-1929)
Sir Robert Vansittart (1930-1937)
Sir Alexander Cadogan (1938-1946).
The permanent under-secretary for foreign affairs, 1854-1946 by Keith Neilson. ISBN 9780203012673. Published by Routledge in 2009. Publication and catalogue information, links to buy online and reader comments.