Thank you all for an informative and amusing thread. I hope now that my rellies have accepted that this is not their Great Grandad.
Just diverting a moment to the Coldstreamer, what would have been a Drummer's battlefield duties?
I assume the photo is pre-1914, but just how "pre-1914"?
Does the crumpling of the hankie provide any clues

Fascinating that you, r973g, were wearing the same uniform in 1948/49.
Seasons greetings to you all.
Dave