Manuscript, printed and photographic materials amassed by Hudleston during the course of a varied career. The collection relates chiefly to Northern families and clergy, as well as to the history of the North of England and of Bristol and Gloucestershire, and also includes some original records of Gretna Green marriages.
Among the papers are: extensive (chiefly manuscript) notes on and transcripts of an immense range of historical documents from a great variety of record repositories, libraries and private sources, the originals of some of which are no longer extant; photocopies and photographs of many documents and printed sources; some original documents; examples of Hudleston's world-wide correspondence on genealogical and historical topics; biographical indexes; pedigrees; notes, drafts and texts for his writings and lectures; and many printed items, including pamphlets, offprints and press-cuttings.
Some sections of particular interest are: an alphabetical card-index of biographical information relating to the clergy of the Northern Province of the Church of England from the Reformation to the 20th century but especially strong for the 18th and 19th centuries; approximately 600 folders of notes, pedigrees etc. relating to the histories of individual, chiefly northern, families, together with a series of envelopes containing smaller amounts of material on other families and a number of box-files, cartons etc. of material on particularly well-documented families; preparatory material for and drafts of his articles and books, together with the unpublished typescript of a book on Durham families and heraldry (a companion to his published books), and a series of cards containing manuscript entries for a companion volume on Northumberland families, plus a smaller number of cards on the armigerous families of Sussex; a series of original registers and loose sheets recording the irregular marriages which were performed by Robert Elliot and his predecessor(s), including Joseph Paisley, at Springfield, Gretna Green from the late 18th century until about 1839, together with a card-index to the names in the entries which was prepared by Hudleston; a series of volumes containing many of the newspaper articles on the history of Bristol and the surrounding area which were written by Hudleston.