Soldiers Died in the Great War (of which ODGW is a part) is available on Ancestry.
This may be useful from the National Probate Calendar (also on Ancestry):
William Walter Hammond of Capworth House, King Street, Southsea, Hampshire; Major in the RGA; died 5/5/18 in France or Belgium.
Administration 22nd July, London, to Charlotte Marion Hammond, widow.
Effects £266 7s 6d.
His medal index card was a pain to find. He was previously Battery Sergeant Major, 24711 in 116 Heavy Battery RGA.
It also shows an earlier address of 4 Portland Terrace, Southsea.
Phil
Hold on Wendy, I can't keep up