Hi there Jim
I came across a obituary notice online William died on July the 8th 1948, 103 Great South Road, Epsom, William Miller (regi no 38711, South African War) aged 70 years, he is buried at the Waikumete Soldiers Cemetary
They had a son Ian Francis Desmond Miller who died in the second world war aged 21, he died on the 30th July 1940 and is buried at Brookland Military Cemetary, Woking, Surrey, England.
My Nana was Ellen Joyce Miller and there were two other daughters also Molly and Edith.