Bill, here is old paper on this subject from 1972. Deals with disarming and people control . It appears the British were a little more aggressive in COIN ops then they admit to, read the death penalty section.
Absolutely, the Brits coined the phrase "concentration camp" in the Boer War when they rounded up Boer families to cut the Boer commandos support network. What hurt them in doing so was basic medical and sanitation planning and the resultant epidemics inside those camps.

Best

Tom