A very tiny bit more info:
His service number when he first enlisted was 2859. It is also attached to a second service number of 39399.
The 39399 has him mistranscribed as surname "Etton". The index for his reenlistment (at Green Point, which is by Cape Town) in Dec 1901, (had been discharged from 2859), says he was Canadian, a planter, and NOK was his brother, D. Etton, residing Montreal. Sadly no address, just GPO Montreal.
So possibly the Wm Elton, his first NOK, was his father?