For official correspondence, see among political papers, below. For additional family correspondence, see among estate and financial papers.

Including letters from Léon Lalanne, 1859-1871; Lord Kimberley, 1871-95; W. E. Gladstone, 1880-6 (further letters are among the political papers); also from J. G. Denison (Speaker of the House of Commons); the Duke of Westminster; Lord Selborne; Sir Charles Dilke; G. O. Trevelyan; Joseph Chamberlain; and the Duke of Devonshire.