Hi Peter,
Some lovely sets here!
Here is what I see, 1st one is a group of band figures and marching soldiers by Johnhillco they are Grenadier Guards and were mainly sold as individual figures. I believe they also came in a version as Scots Guards. These appear to have white plumes on their Bear Skins so that makes them Grenadier Guards. I will see if I can come up with a ball park price for them but I would think about 8-12 per figure.
The Mounted figures are Horse Guards and are from post 1935 (red collars give that away) they are likely from the post war era so I would say about 10 to 15 per figures is a good place to start with pricing. I believe that they were also sold as set 9209 in the 1960s but I will have to see if I can find one of my references.
The last set is a nice one even with the rather typical damage of a missing leg. They are Argyll and Sutherland Highlanders Kilt gives the clue here Grass green on dark green from set 2063 and because there is 6 figures its prior to 1960. Price would be 8 to 10 or so per figure. Nice set, I would be interested in, does he have the broken leg? Its not a hard one to fix if so.
The other two sets are Civil War and I will see if I can run down the set numbers if no one else does today.
Hope this helps
Dave