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Thanks everyone, ill dig into the above suggestions. 

And yes, i should have been a little clearer, im not worried about the following error stuff, i was just happy to be seeing signs of life. 

Ok, think I have figured it out, most of it at least. Had to make a visual representation of the HAL finnstrom posted. See attachement. Also got it sort of working on my machine. Tanks so much!Some things I'll try to adopt

• Instead of controlling with coolant-mist, I would do it with a motion.digital-out pin controlled with M62 and M63
• Trying to get the w_offset from actual w0 in current coordinate system. My thought is to touch of both Z to the work piece, and set w0 in G54 (for example) at the desired height. Then, somehow in HAL, calculate the w0 offset from w joint zero. In the (unlikely) event that I need dust shoe for G55 etc, this should enable this to work.
• In conjunction with above, I think I need jogging to work (in qtdragon) to easy set w0 current coordinate system.