The majority of this collection can only be consulted on microfilm, MIC/ 570. This large collection of c.7450 documents and c.40 volumes is listed in detail in a 5 volume calendar. The collection includes, for example:
Letters from Frances, Marchioness of Londonderry, 1792-c.1821.

4 volumes of typescript letters of members of the Stewart and Pratt families, 1775-1827.

A volume of typescript copy letters to Emily, Viscountess Castlereagh and later as Marchioness of Londonderry, from Lord Stewart, together with typescript copy letters of condolence on the death of her husband, 1790-1828.

Letters to Frances Anne, Marchioness of Londonderry, from Benjamin Disraeli, Prince Gortchakov, Count Brunov and Mary Duchess of Gloucester, 1850s.

Letters to Frances Anne, Marchioness of Londonderry, from her children, c.1840s-1860s.

2 volumes of miscellaneous papers of Lady Londonderry, 1813-1841; 1848-1849.

A volume of letters from Czar Alexander I to Frances Anne, Marchioness of Londonderry, c.1820s.

A volume of copy letters in Lady Frances Anne Londonderry's handwriting writing about a visit to Russia, c.1849.

A bound journal in Frances Anne, Marchioness of Londonderry's handwriting of a continental tour, c.1840 [see also D/278/24/1 for a printed account of Frances Anne, Marchioness of Londonderry's visit to Portugal, Spain and Africa, c.1840s].

A bound history of the Vane-Tempest family, including some original letters, c.1850s.

2 volumes of typescript copy letters from Lord Castlereagh to his wife, during their frequent periods of enforced separation. The letters are mainly of a personal nature, but include occasional allusions to contemporary events, 1794-1821.

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