Arthur Thomas Nixon born 1898 Wellingboro. so not Zulu War.
Henry Edward Nixon enlisted 8 march 1876 born 1858 Wellingborough, to 29 Brigade No.280 58th Regt, to S Africa 26 Feb 1879 to 6 July 1881, served Zulu War and first Boer War, papers state Gunshot wound to chest [presume in the 1st Boer War] to Netley and Discharge 9 Aug 1881. His papers state throughout four or five times in bold ink stamp deceased but no mention of date.
I cannot find any death date until 1 May 1943 address 6 Alexander Rd Wellingborough from his probate to his widow Florence. He Married Florence Maycock in Wellingborough 1902.