In the census of 1881, JOhn aged 15 is listed as a clerk with the 'telephone company'.
Sources
England and Wales Census, 1881," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q27W-Q6C3 : 18 August 2016), Janet Stewart in household of John Stewart, Milton-Next-Gravesend, Kent, England; from "1881 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing p. 11, Piece/Folio 873/44, The National Archives, Kew, Surrey; FHL microfilm 101,774,422.
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with John: