Here is a sticker for him: {{The Great War}}
https://www.wikitree.com/wiki/Help:Stickers_for_Veterans#The_Great_War
Or how about this one? (I prefer it) {{Roll of Honor |category=Killed in Action, United Kingdom, World War I |image=Roll of Honor Template-15.jpg or Straiton-26.jpg |description=Killed in Action |war=World War I }} https://www.wikitree.com/wiki/Category:Killed_in_Action,_United_Kingdom,_World_War_I