There is a James O'Hara on the St Ninians RC memorial. 

Only James O'Hara in Irish Guards on CWGC is #1763 born Edinburgh died 08/10/1915 ST. MARY'S A.D.S. CEMETERY, HAISNES

There is a newspaper announcement of his death

Newspaper Clippings relating to James O’Hara

James O’Hara