Jim1 the Family are over the Moon with your finds !
They visit Estaires twice a year but never knew exactly where he died or how.
They are truly gobsmacked.
Ancestry found his Soldiers Effects Record which never came up under his serial numbers when I searched.

Any idea what the abbreviations in black in June and July 1917 above entry for his Widow Sarah Jane.
Surprisingly no Dependents Pension card comes up for his Widow unless someone can find it.