Okay, his naturalisation papers are on FamilySearch:
Declaration of Intention 1892:
https://www.familysearch.org/ark:/61...A1%3AQGG3-TRFN
and acceptance of his application in 1896:
https://www.familysearch.org/ark:/61...A1%3AQGG3-FC1Z
But not a form with his full details, including spouse, on, which I was hoping for.
Edit - snap, Janet!