http://peopleofindia1868-1875photos.blogspot.com//2011/04/british-raj-life-of-british-army-html
And, I’m not at all sure of this source, but it seems that there may, in fact have been extensive slavery under the British in India. This source (if it’s correct, I can’t verify now) says that the Slavery Abolition Act of 1833 included a clause that allowed slavery within India and enslavement of Indians for colonial markets through the East India Company:
Would be interesting to find out more. In any case, I don’t think the Indians were happy campers under the thumb of the British.