Not KDG by looking at that link Dwarf
It's not the ASC the 2 bottom bits of the star are very distinctive not sure what it is.
Bandoliers were worn by Coldstreamers with other jackets in the trenches, so the only visible clues are badge, buttons, cap, and a white lanyard also worn by RA and Marines :-\ But still links to ammo or artillery then (nags). There is a sense this bloke was pictured 1914-1915, and the cap may be just a serge trench cap. No ribbons over his breast pocket, but a bible or diary ( fitted in there nicely) or his letter for mum , were sometimes kept over the heart. You can see something sticking out of the pocket.
Chaps, on behalf of another, I'm trying to get some details on this gentleman.
Is there anything you can glean from the uniform? Anything would be appreciated as he knows very little on this relative of his
Edited - Christ you lot are quick....