Does anyone who caves for work (instructor/guide etc) mount their head lamp directly to your helmet? IE do you drill holes in your helmet to mount the torch?

People do, but not as common as it used to be.

Sailingneil said:

Does anyone who caves for work (instructor/guide etc) mount their head lamp directly to your helmet? IE do you drill holes in your helmet to mount the torch?

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Yes.
I have a Scurion fitted to my helmet but I only use PIXA lamps with elastic/rubber bands for my clients. The helmet is inspected like any other bit of my kit and the assembly is done in a way that does not create extra hazards (i.e. bolt ends pointing at skull!).
Some guidance from HSE which you might find useful...
https://www.outdoor-learning.org/Portals/0/IOL%20Documents/AALS%20Log/2009-Present/200903%20Fitting%20lamp%20brackets%20to%20helmets%20for%20caving%20.pdf?ver=2017-06-28-153200-663

I thought the main (caving) purposes of a helmet were for for when you bang your head (either on the roof or perhaps more importantly in a fall) and for holding a lamp. I'd always assumed that the sort of blow from a falling object which has enough force completely to smash a helmet potentially weakened by drilling would have probably killed you anyway. None of this is based either on direct experimentation or reading the results of others' experiments; it's purely an impression I've always had. As ever, I'm more than willing to be proved wrong by evidence and would really welcome comments here by people who know a lot more about this than I do. We can all learn.

Modern helmets are not as rock solid as the previous generation & are designed to actually break, whilst they absorb the impact.

I have replaced my old hard shell (Petzl best) with another hard shell (Petzl Vertex Vent) so not too worried about the structural strength of the helmet.