Granted Neil 
Here's the original without the pretty touch-ups. From previous chats, we think this is the dress uniform.
Regards
WC
It's not the dress uniform WC, but the undress frock. The frock was a working, or barracks uniform, and it was cut to be more loose than the full dress tunic and was made of lesser quality cloth. It was generally unlined, although men could pay to have a lining fitted if they wanted to, and it had 5 buttons to the dress tunics 9.
The frock had a red collar and yellow tracing, as well as crows feet (or trefoil loops) on the cuffs. He also has a single good conduct badge (inverted chevron) on his left forearm which indicates 5-years of blemish free service. The frock was worn in lieu of the full dress tunic when overseas, as its lack of a lining and ease of upkeep made it a more practical uniform to maintain when away from Britain.
The helmet in the background has a ball top which tells us that the photo was taken after 1881 when the ball top replaced the earlier spike. The frock was finally replaced by the new khaki "service dress" in 1902.
He is wearing white gloves and as well as his full dress helmet he is carrying a riding whip as for a mounted artillery "driver". All these items together represent a form of "drill (i.e. parade) order" and when going out of barracks, in "walking out dress", the helmet would be replaced by a "pill box" type forage cap.
