Muttley , as a "scholar" of WW2 you will know that Belsen was liberated by UK forces. That on it's own would be rather more than 5% of the death camps.
Anyway, it was just chance which army liberated camps. If you are really saying that Britain did not play its part in the liberation, we will need to talk further.
I am also surprised that you think Britain was the first to bomb a city full of civillians. Heard of Guernica? British cities were probably the first to be so bombed, by Zeppelins in WW1