Don't know if this can help, they're interested in the Gordons prior to the '40s but might be worth a try. GORDON HIGHLANDERS 1914 - 1918
They should be able to point you in the right direction as where to find info quickly though.
As an aside, my best mate was in the Gordons up until they disbanded, and my Platoon Sergeant at the Depot was in them too.
One of my uncles transferred to them in the 60's when the Argylls were put down to just Balaklava Company.
Good guys and a decent regiment - even if they all spoke with a funny accent.