No baptism in Faringdon for Benjamin that I can find.
From Faringdon PRs Transcripts
1858 Jan 31, COOPER, Charlotte Brangwen, d/o Benjamin & Charlotte, chem
1861 Nov 24, COOPER, Julia, d/o Benjamin & Charlotte, chemist
1864 Jan 31, COOPER, Beatrice Mary, d/o Benjamin & Charlotte, chemist
1866 Mar 25, COOPER, Benjamin Castle Arthur, s/o Benjamin & Charlotte, chemist
1868 Oct 26, COOPER, Joseph, s/o Benjamin & Charlotte, chymist (priv)
1870 Apr 24, COOPER, Harry Percival, s/o Benjamin & Charlotte, chemist
Burial
1868 Nov 2, COOPER, Joseph, 2 wks
1868 Nov 14, COOPER, Benjamin, aged 25 (There was a Benjamin and Henriette having children there as well, probably that Benj.)
1870 Oct 27, COOPER, Henrietta, aged 27
No other burials or marriages in Faringdon.
Am guessing Benjamin died Sep qtr 1884, Kingston, aged 56. This is near where Charlotte was in 1891.
Ian C