Gerard,
I have looked in Infantry Division Battle Insignia 1917 booklet no inverted black triangle is listed as worn but it may be undocumented. There is a note in the booklet that the chequerboard insignia may only have been worn post hostilities. I am not sure if this applies to helmets but to note 34th Dive became part of the army of occupation in 1919. A few 34th Div helmets have surfaced over the years so possibly souvenirs brought home by demobbing tommies.
all the best Mark
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