I do recall that one of our club members had one of those big belt-mounted carbides and, instead of the flexible car hydraulic system pipe from the generator to the headset (which most of us used), he had ordinary thin rubber piping.
Somehow he always managed to lean against the wall near the beginning of the trip, squashing the pipe flat and putting his light out. So he always had to stop and fettle it for ages, saying, "You chaps just go on without me ...".
Thus he had the perfect excuse for never actually going caving. :