Hi Katie, this is a hard question, primarily because it is someone in a B&W photo who appears to be wearing a scarlet tunic. The best we can do is identify what we can, and see if others can pick up the thread. If the photo was in colour, then even the colour of the facing on the collar and cuffs might help identify a regiment; and a better image of the collar dogs or Shako plate would be most useful. However, what I have observed:

1) the tunic appears to be of the standard British 8 button design with (what is usually referred to on this site as ..) a braemer cuff. This seems to place the uniform in the 1850s. What is interesting about the tunic, is the notch in the collar. Usually the collar does not have a gap - that might be a helpful bit.

2) The trousers do not seem to be of tartan material, nor is there is discernable stripe. Therefore I am want to conclude that they are a standard issue with the narrow strip of an enlisted man or NCO.

3) two things of interest are the fact that he carries a stick (which usually is an indication that he commanded men supporting the above conclusion of an NCO), and there is an insignia of some sort on the farthest (right) arm just above the cuff, which seems to include a starburst pattern. Can anyone else identify what it might be?

Alas most regimental prints seem to depict uniforms after 1860, too late for this uniform - in my estimation. I'm afraid that's the best I can do, but I do hope this helps others to join in.