Hi Rog
The bottom bit of the shoulder title will show the county unit. It looks a short one, like Herts, Hants, Kent etc.
You really need to provide more pixels. If you cannot increase the resolution on your scanner you need someone with a digital camera - the more mp the better, or a good magnifyiing glass. All this assumes you have the original photograph.
You need a T/RFA expert to tell you if the territorial outfits were kept separate throughout WW1. If so, that uniform was used from 1908 (?) to at least 1920. I think they moved the lanyard to the other shoulder then. Or is that another Corps?
Even better would be to find his service record or medal card on Ancestry - while it's free.
Lanyards were original used to fire the gun, to stop the recoil taking your head off. Even in WW1 a lot of guns needed a lanyard rather than a trigger. They didn't use the uniform lanyard though. That was just part of the uniform and much too short. He probably had a penknife at the other end.
If the photograph is WW1 his rank is Bombardier. After WW1 they got rid of the rank of Corporal. All Corporals became Bombardiers (with two stripes) and all Bombardiers became Lance-Bombardiers (with one stripe).
Ken