The archive consists of:

• literary manuscripts, 1950s-1970s
• notebooks and journals, 1906-1973
• correspondence, c. 1890-1972
• poetry, 1920s-1930s
• sketches, 1900-1920

Literary manuscripts in the archive comprise mainly drafts of autobiographical works, including

• A Smile for the Past (1959)
• An Asset to Wales (1970)
• Ancestral Voices (1972)
• drafts of unpublished memoirs, 1970s

There are often drafts of, and notes for, her novels in her notebooks. However these mainly consist of journal entries concerning

• her family life and her career
• her travels in Europe (especially Austria and France) and America
• comments on both World Wars
• anecdotes concerning friends (such as E Nesbit)

The notebooks also contain notes, for instance on

• a First World War aircraft factory, 1914
• the day-to-day life of nurses, c. 1914
• a film location shoot in the Tirol, 1933
• the trial of Saunders Lewis, Lewis Valentine and D J Williams, 1937

The correspondence (mostly pasted into her notebooks) includes letters from friends and acquaintances such as

• Alec Waugh
• Alys Meirion
• Gwen Ffrangcon-Davies and Marda Vanne
• Rudyard Kipling
• J B Priestley
• Emlyn Williams
• Amy Johnson
• Osbert Sitwell
• Vicki Baum
• Edgar Wallace
• Rebecca West
• Geoffrey de Havilland
• Vita Sackville-West and Harold Nicolson
• Bernard Darwin (her cousin)
• Nancy Mitford
• Barbara Cartland
• Gwyn Jones
• Glyn Jones

Her career as an illustrator is represented by various sketches and drawings, 1900-1920. There are also miscellaneous sketches to be found in her letters and journals.