Althorp Papers. Vol. mmdxcvi. Account book showing Sir George Francis Seymour and Sir Horace Beauchamp Seymour's account with Messrs. Child and Co.; 1839-1844. Bound volume.
Althorp Papers. Vol. mmdxlix. 1. Letters to Lady Clinton from her stepson, Beauchamp Seymour; 1852-[1875?]. For Lady Clinton's letters to Beauchamp see Add. MS 77871. 2. Letters to Lady Clinton from other correspondents; 1835-[1865?], n.d.
Althorp Papers. Vol. mmdxliv. Letters to Horace from his younger son Beauchamp; 1828-1850, n.d. For letters from Horace to Beauchamp see Add. MSS 77868-77869.
Althorp Papers. Vol. mmdxciv. Letters to Sir Horace Alfred Damer Seymour K.C.B., (b. 1843, d.1902), 4th son of Frederick Seymour (see Add. MS 77893 above), private secretary to W. E. Gladstone. Most, relating to Ireland, are from his brother in law John Poyntz, 5th Earl Spencer; 1869-1902.