Thank you for the invaluable feed back, I can see now how scary this situation is.
The ingredients for some glazes includes Lead bisilicate at up to 60% and Copper oxide 1 to 3%, what does this mean?
I am processing all you have said and before I read these replies I requested we use glazes without lead.
However I now feel that the whole operation and workshop set up needs to change dramatically to meet the correct safety levels required.
I'm taking advice and getting blood tests done, as I can see that everything you have brought up points to reporting this situation.