Stanley died of wounds in France:

Name: Stanley Stuart
Residence: Hammersmith, Middx.
Death Date: 22 Mar 1918
Death Place: France and Flanders
Enlistment Place: London
Rank: L BDR.
Regiment: Royal Horse Artillery and Royal Field Artillery
Battalion: Territorial Force
Regimental Number: 915577
Type of Casualty: Died of wounds
Theatre of War: Western European Theatre

Register of Effects states his mother is Louise and Sister is Jessie.

Mike