Not really the best place to discuss the real world effects of the British Empire, but it wasn't all bad. Among other things the British Empire:
Worked to abolish slavery, not just banning it, but actively hunting down slavers and setting up a colony of freed slaves.
Creating disaster relief services in India. Previously if a monsoon wiped out an areas crops everyone starved. The Empire set up a system to deal with that, which continued well after the British left India.
Provided education, medical services and infrastructure.
The Empire also provided the manpower and resources to help bring about the defeat of Germany and Japan. When Japan offered India independence from the Empire in WW2, India responded by creating the largest all volunteer army in history and fighting for the Empire.
There is a modern trend to link the words Empire and Evil together, but it is a LOT more complicated than that. As with any world power, they did a lot wrong, but they also did a lot to improve the conditions in the places they went.
Back on topic, the minis in the KS look nice, but I think the uniforms look a little plain. The Dragoons could use proper helmets, either with more decoration on the front or at least a neat looking plume. The art for the KE infantry shows them with some webbing which the minis appear to lack.
The infiltrators look great though.