Original source material relating to Little Washbourne, and other parishes in Diocese of Gloucester may be found at the Gloucestershire Archives; with the exeception of Bishops Transcripts, which (if they exist) should be found at Worcestershire Record Office.
"Chapelry of Overbury, Worcestershire. Former tithing of Overbury, transferred to Gloucestershire, 1844. In civil parish of Dumbleton since 1935." (Ref: Guide to the Parish Records of the City of Bristol and the County of Gloucester; I. Gray & E. Ralph, 1963)