"The British apparently felt that with the hammer spur removed, the chances of the gun sustaining such a blow would be much less and the safety stop could be eliminated to speed production."
In fact, right through the end of the war wasn't it standard policy for the British to use a lanyard to attach the revolver to the soldier?
That alone would make a drop fire unlikely as I don't believe the lanyard is long enough to allow it to hit the ground.
But, it should also be noted that after the war, all of those revolvers were (or were supposed to be) recalled to be fitted with the hammer block.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.