First was The Mystery Knight. It's not quite as good as the other Dunk & Egg stories, but it's still good, and worth reading. Again, a wandering knight and his squire come upon some trouble, and mess it up for the bad guys. That's the simple plotline.
Next was Osprey Men-at-Arms #3: 30th Punjabis, not bad. Why this regiment, though?
Then Osprey Men-at-Arms #35; Wellington’s Peninsular Army; Osprey goes back to this army again and again. Heck, this war is the source of many miniature armies because of the stunning uniforms. This book gives some general background of how this particular force was organized.
Next, Osprey Men-at-Arms #47: The South Wales Borderers famed for the defense of Rorke's Drift in the Zulu Wars. Sad ending, though, as the British Army shrank in the latter part of the Twentieth Century, lots of famous regiments disappeared, swallowed up in reorganizations. This one, two; it's part of the Royal Welsh Regiment.
Finally, for the moment, Osprey Men-at-Arms #52: The Royal Green Jackets; riflemen in an era of muskets. Better accuracy but slower rate of fire.