In 1917 Voysey moved to a small flat in St James's Street in London, and he lived there until ill health took him to the Park House nursing home in Winchester in 1940 (where he died in February 1941). Voysey's books were inherited by his son Charles Cowles-Voysey and many years later they were included amongst family gifts made to the Royal Institute of British Architects (RIBA), where they have remained as a group in the library at 66 Portland Place, London (although not separately catalogued).
The collection numbers just forty-five volumes and, whilst some books may not have found their way to RIBA, it seems reasonable to assume that – with limited space available in the nursing home – they probably represent the bulk of what remained. In their various ways, they also probably reflect what mattered most to Voysey in his final years. A strong indication of this are the three volumes about his family forebears the Wesleys, one of which shows Voysey and his siblings as recent additions to the Wesley pedigree. Another is inscribed to him by his father, the Reverend Charles Voysey, and one bears the signature of Voysey's wife Mary, from whom he had been separated for many years. Several more are inscribed to Voysey, including one from his brother Ellison to "Charley", an unfamiliar form of his name, so used are we to reading the rather formal "CFA".
Most of the books carry Voysey's personal bookplate, designed in the 1890s, whilst three early volumes bear a previous Voysey coat of arms bookplate.
- John Wesley, by Arnold Lunn (1929)
Inscription: "C.F. Annesley Voysey April 9, 1929"
- John Wesley's journal, abridged by Percy Livingston Parker with an introduction by the Revd H.P. Hughes and an appreciation by Augustine Birrell (1902)
Bookplate, dated 1903
- Memorials of the Wesley family : including biographical ... studies of all the members of the family ... together with a genealogical table of the Wesleys, etc, by George John Stevenson (1876?)
Inscription: "C.F.A. Voysey April 9, 1891". Includes loose pedigree of the Wesley family, 938-1875 (including Voysey) and loose photographic card
- Lay thoughts of a Dean, by William Ralph Inge (1926)
Inscription: "C.F. Annesley Voysey September 1, 1934"
- The Heroes of Asgard, by the author of "Mia and Charlie" and her sister [i.e. by Annie Keary] (no date: 1857?)
Inscription: "Charles F.A. Voysey". The title page is missing
- Great English painters : selected biographies from Allan Cunningham's "Lives of eminent British painters", arranged and edited with an introduction by William Sharp (1886)
Voysey coat of arms bookplate
Inscription: "C.F.A. Voysey Decr 2, 1886"
- Evolution and ethics and other essays, by Thomas H. Huxley (1894)
Voysey coat of arms bookplate
Inscription: "C.F.A. Voysey Octbr 1894"
- In tune with the infinite, or fullness of peace, power and plenty, by Ralph Waldo Trine (1915)
Inscription: "C.F.A. Voysey"
- Individuality, by CFA Voysey (1915)
Inscription: "C. Cowles-Voysey from his loving father. April 1915". Presumably not in CFA Voysey's possession at the time of his death but added by the family later
- The Ingoldsby legends, by Thomas Ingoldsby (1889)
Inscription: "For Charley & Mary with best love from Ellison [Voysey] Dec 1890".
- The Vision : hell, purgatory and paradise, of Dante Alighieri, translated by Revd Henry Francis Cary (1868)
Inscription: "Charles Annesley Voysey from SCI Jan 1st 1878". Identity of "SCI" unknown
- A week on the Concord and Merrimac rivers, etc, by Henry David Thoreau, with a prefatory note by Will H. Dircks (1889?)
Bookplate, dated March 1, 1905
Inscription: "From one friend to another friend Feb 18 05". Inscribed by Dircks?
- Oxford, by H.J.L.J. Massé (1906)
Bookplate, dated October 1906
Inscription: "To C.F.A. Voysey from the Author in remembrance of a joint visit H.J.L.J. Massé".
- Two essays on old age & friendship, by Marcus Tullius Cicero, translated by E.S. Shuckburgh (1900)
Inscription: "To my beloved son Charles Francis Annesley Voysey July 1901". Inscribed by Rev. Charles Voysey
- An Introduction to the study of colour, by John Littlejohns (1928?)
Inscription: "To C.F.A. Voysey with respectful trepidation – J Littlejohns" (see photograph)