Roy Hudleston was a distinguished genealogist and historian. In 1949 he was elected a Fellow of The Society of Antiquaries in recognition of his significant work in the fields of local history and genealogy, his life-long abiding interests. Spurred on by his fascination with the history of his own ancestors, particularly the Huddlestons of Millom Castle and Hutton John, Cumbria, he began writing local history articles at an early age, and some of these appeared in the Stroud News while he was still at school. He subsequently published many articles on Bristol's history in the local press, and was also a regular contributor to the Transactions of the Bristol and Gloucestershire Archaeological Society, of which he later became President.
Much of his research came to fruition with the publication in 1975 of a book entitled An Armorial for Westmorland and Lonsdale, prepared with Robert Boumphrey and J.(Fred) Hughes and followed in 1978 by the appearance of a companion volume on Cumberland Families and Heraldry. Most appropriately he was elected as the first President of the Cumbria Family History Society.