Welsh School, Ashford, and British Charity School, Board of Governors and trustees minutes, 1718-1848; House Committee minutes, 1830-1905; cash books and financial records, 1792-1905; applicants books, 1826-1844; correspondence and papers, 1760-1904; correspondence and records of the Society for the Diffusion of Useful Knowledge in Wales, 1849-1851; correspondence relating to Llandaff Diocesan Commitee, 1849; and deeds and legal correspondence relating to lands in Ashford, Middlesex, 1845-1893; minute books of the Society of Ancient Britons, 1823-1856, and of the Cymmrodorion, 1828-1849.

A further deposit of papers comprising committee minute books (5), 1905-1987; household wages books (4), 1949-1958; accounts books (3), 1846-1974; receipts and payments books (7), 1813-1963; apprenticeship book, 1852-1853; letters book, 1839-1849; Schoolmistress report book, 1868-1882; attendance and fee register, 1923-1940; confirmation book, 1916-1964; school reports, 1848-1873; house mark book, 1941-1956; House Committees visiting book, 1880-1891; cash books (3), 1932-1956; general fund book, 1949-1958; inventory and valuation book, 1946; school numbers book, 1945-1957; and an investments book, 1940-1949.

Papers, [1939]-2007, pertaining to the school, accumulated by Jacqueline Flindall, a former pupil of the Welsh Girls' School, including letters and items relating to the 150th anniversary celebrations in 2007.