As nobody else has chipped in, here goes with my thoughts.
The uniform appears to be standard WW1 service dress, as worn by many thousands, but with a smartly tailored collar. He seems to be a private or equivalent rank. The lanyard on his left shoulder is not really a clue, as soldiers were all issued with one. The object hanging from his pocket is probably a civilian watch chain. On his left sleeve above the cuff is a wound badge, so he must have seen active service. I cannot detect any evidence from the uniform.
More later if I can find anything.
A