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I was puzzled before as the braiding for Artillery uniforms looked less decorative compared to this as you say. But the Hussars uniform of that era does look close to this.

Thanks a lot for your info. It's really much appreciated

The medal on the right is the Khedive's Star, a campaign medal issued to men who had participated in the campaigns in Egypt and the Sudan between 1882 and 1891.

https://en.wikipedia.org/wiki/Khedive's_Star

I'm amazed that you identified the medal as the detail is so poor. It looks just like the Khedive's Star as you say and you can just about see a crescent moon above the bronze star.

I looked at the medal roll for those who were awarded it on the National Archives. It shows the Royal Marine Light Infantry, Royal Marine Artillery, and the Navy received that medal.

Is it possible this is the Royal Marine Light Infantry uniform while in Sudan? but the hat looks really curious. I'm not sure where to find solid info about uniforms of that era.