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)
No bookplate
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
No inscription - 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?)
Bookplate, undated
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)
No bookplate
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?)
No bookplate
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)
No bookplate
Inscription: "C.F.A. Voysey" - Individuality, by CFA Voysey (1915)
No bookplate
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)
Bookplate, undated
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)
No bookplate
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)
Bookplate, undated
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?)
Bookplate, undated
Inscription: "To C.F.A. Voysey with respectful trepidation – J Littlejohns" (see photograph)

- Ideas : "Buch le Grand" of the Reisebilder of Heinrich Heine, 1826 translated by I.B. (1884)
Bookplate, undated. Also has Voysey coat of arms bookplate
Inscribed: "Mary M. Voysey" - Notes on noses, by Eden Warwick [pseudonym, i.e. George Jabet] (1893)
Bookplate, dated August 1925
There are two inscriptions but may be old and unconnected with Voysey - Art and beauty of the Earth, by William Morris (1898)
Bookplate, dated April 6, 1899
No inscription
(Dr Wendy Hitchmough notes (CFA Voysey (Phaidon, 1995), pp.18 & 224 (chapter 2, note 19)) that there was one other Morris item amongst those passed to Cowles-Voysey, also bearing Voysey's bookplate and dated April 6, 1899. This was An Address delivered by William Morris at the distribution of prizes to students of the Birmingham Municipal School of Art on February 21, 1894 (Chiswick Press, Longman, 1898). This volume is not at the RIBA.) - English men of letters : Laurence Sterne, edited by John Morley (1882)
Bookplate, undated
No inscription - English men of letters : Thomas Moore, by Stephen Gwynn (1905)
Bookplate, dated February 1905
Noinscription - Facts and comments, by Herbert Spencer (1902)
Bookplate, dated December 1903
No inscription - The Theory of moral sentiments, by Adam Smith (1892)
Bookplate, dated March 1906
No inscription - Critical & miscellaneous essays, vol. 1, by Thomas Carlyle (1899)
Bookplate, dated Sept 29, 1902
No inscription - Sir Roger de Coverly and other essays from 'the Spectator' [a selection from the essays of Addison and Steele] edited by Arthur Symons, with illustrations by H.M. Brock. (1905?)
Bookplate, dated 1905
No inscription - The Pilgrim's progress, by John Bunyan (1905)
Bookplate, dated March 30, 1905
No inscription - The Mind of the artist : thoughts and sayings of painters and sculptors on their art, collected and arranged by Mrs Laurence Binyon (1909)
Bookplate, undated
No inscription - The Poet at the breakfast table, by Oliver Wendell Holmes (1902)
Bookplate, dated May 28, 1903
No inscription - The Professor at the breakfast table, by Oliver Wendell Holmes (1902)
Bookplate, dated May 28, 1903
No inscription - Name this flower, by Gaston Bonner (1917)
Bookplate, dated July 6, 1925
No inscription. Has a few pressed leaves between pages - The Temple of art, by Ernest Newlands Smith (1904)
Bookplate, dated 1904
No inscription - The Complete works of John Keats, vol. I : letters, edited by H. Buxton Forman (1900)
Bookplate, dated October 1906
No inscription - The Complete works of John Keats, vol. II : letters, edited by H. Buxton Forman (1901)
Bookplate, undated
No inscription - Bacon's history of the reign of King Henry VII, by Joseph Rawson Lumby (1902)
Bookplate, dated January 1912
No inscription - The Quest of the ideal, by Grace Rhys (1913)
Bookplate, datedMay 1913
No inscription - Essays of Montaigne, selected and edited by Percival Chubb, Florio's translation (1886?)
Bookplate, dated August 1909
No inscription - The Republic of Plato, translated with an analysis and notes by John Llewelyn Davis and David James Vaughan (1901)
Bookplate, dated May 28, 1903
No inscription - The Nicomachean ethics of Aristotle, with a preface and notes by Revd D.P. Chase, an introduction by G.H. Lewes, and edited by J.M. Mitchell (1906?)
Bookplate, dated August 1910
No inscription - The Trial & death of Socrates, translated by F.J. Church (1901)
Bookplate, dated May 28, 1903
No inscription - William Blake, by G.K. Chesterton (1910?)
Bookplate, dated January 1911
No inscription - Wayside and woodland trees, by Edward Step (1905)
Bookplate, undated
No inscription - The Light of Asia, by Sir Edwin Arnold (no date)
Bookplate, dated March 1909
No inscription - Familiar studies of men and books, by Robert Louis Stevenson (1905)
Bookplate, dated March 1905
No inscription - Eighteenth century studies, by Austin Dobson (1914?)
Bookplate, date February 1916
No inscription - The Journal of a tour to the Hebrides with Samuel Johnson, by James Boswell (1901)
Bookplate, undated
No inscription - A Companion dictionary of the English language, by James Henry Murray (1892?)
Bookplate, dated January 1900
No inscription. "Francis" and "Annesley" on bookplate crossed through, possibly by Cowles-Voysey