The full range of rulebooks, army lists and source books published by Solway Crafts and Miniatures for gaming 1938 - A Very British Civil War (VBCW).
There are two sets of rules available to suit different levels of play.
'Went the day well?" is a platoon level game, units are sections or individual weapons or vehicles, a player will typically command an infantry platoon plus attachments, in a multi-player game a company level engagment could be gamed.
Brigadier '38, is a set of rules for playing larger, brigade level engagments, in these rules a unit of 10 figures represents a complete company.