Try this link for Troop54. They have a category that is literally called "Victoria's heroes". Quality is outstanding in both 75mm and 54mm. http://www.troop54.co.uk/shop.html
Also FeR miniatures has some excellent Victorian era options from a few countries, and not just British subjects. The Crimean war is of particular interest here. I might also add that they have the old Elite Miniature molds and have released some of those classics depicting soldiers from the Crimean war as well. Here is there XIX Century/Colonial era and they are mostly in 54mm with a few in 75mm. Again the quality of these are without peer. https://ferminiatures.com/subject/xix-centurycolonial/
https://www.rdgminiatures.co.uk/1-32/ RDG miniatures features some really good looking figures and dioramas in 54mm from Rorke's Drift and the Crimean War you might want to check out as well.