The Irregular set seems a perfect fit.
If I was going to do this with a Rolls Royce solution though, I’d go for the fabled Chas C Stadden range, which were on plinths and (I think) 90mm. As sold by ‘Tradition’ in days of yore, when it was the only toy soldier shop in London! Every type of British soldier from history, and quite a lot more besides. Not sure if they’re still being made and sold by anybody, but there’s a big second hand market and they are not in short supply. At about 25 quid a figure though, they aren’t cheap. But a dozen or so of them would make a jolly nice collection showing the British soldier through the ages.
If you’ve got a spare few hundred quid and the time to go tracking down and acquiring a suitable selection that is