Actually the British had killed far more than that.
The '100 Deaths by Commie' is a little too conveniently rounded a number, and covers a bunch of different countries with a bunch of different reasons of which millions would have died regardless the system, as they had done prior. Some contend that the death counts would have been higher over the years if their efforts to end famines were never implemented.
Britain clocked 100 million dead Indians - some say 165 million - from 1880 - 1920 alone, 1880 being when they started taking a cenus there. That's 60 short of a century.
You can also add half of Iran in the famine of 1917-19 during that period to the tally, with 8–10 million (if not more) out of a population of 18–20 million.
So about 110 million dead because of England in 40yrs, give or take a million or two.
Take that, ya Commies!