Hi Dave,
I thought the two figures on the right were from LS 2, because I have two similar sets from the British Colonial Army - 1880s: YL 2 Yorks & Lancaster Regt and GH 2 Gordon Highlanders. They are holding their rifles with their right hands on the rifle stock just behind the receiver. On the loading sets I thought the figures had their right hand in the air above the receiver as if loading. I could be mistaken about LS 3 though since I don't have that set or the similar YL 3 or GH 3 sets.
I have a large (more than 1,000 figures) Frontline collection. I have know Gerard Prime and the late Howard Swales for more than 10 years. They told me that I was one of their top 3 or 4 non-dealer customers in the world. However, they may just have said that to puff up my ego. I always buy something from them at both the West Coaster and Chicago shows.
I have a number of old price lists and color sheets of their products that I have accumulated over the years. They never had a catalog, per se. But one can also use their web site, assuming the items are not retired, to help identify their figures.