Althorp Papers. Vols. mdxxiii, mdxxiv. Correspondence with Horace Seymour, brother of Charlotte Spencer. For letters to Spencer from Seymour in his capacity as private secretary to Gladstone see below; 1863-1901. Two volumes.
Althorp Papers. Vol. mdxxv. 1. Letters from Lily Seymour, wife of Horace Seymour; many undated, but circa 1900-1909. 2. Letters from Freda Biddulph, Charlotte Spencer's niece; 1903-1910.
Althorp Papers. Vol. mdxxvi. Correspondence with Lord Charles Bruce, husband of Charlotte Spencer's sister Augusta and librarian at Althorp; 1861-[1904?]. Thomas Coke, Vice-Chamberlain: Appointments as Deputy Lieutenant of Derbyshire: 1700-1715.
Althorp Papers. Vol. mdxxvii. Letters from Frederick Beauchamp Paget Seymour, later Baron Alcester of Alcester, Charlotte Spencer's cousin; 1852-1885, 1894.
Althorp Papers. Vol. mdxxviii. Correspondence with Luke White, 3rd Baron Annaly. Annaly was married to Charlotte Spencer's niece Lilah, daughter of 3rd Viscount Clifden; 1888, 1895-1910, n.d.