Anne - thanks for that: you will see what I've done.
Max - Davidson (and Sowerby) production normally was carried out on two shifts, 6-2 and 2-10. Each had a foreman who was more than capable of handling any immediate problems! I was annointed production manager quite late in my time at Davidsons - the first job title I had had at either place (that was how we worked - everyone mucked in at whatever was needed). The "appointment" didn't make a scrap of difference either money-wise or to what I had been doing anyway.
Bernard - yes, I knew Harry very well. He was inspection foreman (or words to that effect - see above) and also our first-aider. He was well qualified at both jobs, having been a young, skilled glassmaker pre-war and then a sick bay attendant in the Navy, during which he was awarded the DCM. I remember him attending our only fatal accident in my time, nothing to do with glass, someone fell through a roof. He was the only qualified glassmaker on Sowerbys' staff.
That last point brings up a little-known fact, for which I have no explanation at all. The production foremen at Sowerbys had started out either as labourers or semi-skilled assistants whereas at Davidson they had all been skilled glassmakers. Indeed, while I was at D., a vacancy arose and Tom Barton (GM - my boss) made the brave decision to appoint by far our best presser specialising in big Holophane jobs (still on thread!!) as foreman for the long-term gain in spite of the short-term production loss. The strong glassmakers' union meant that, once a man was appointed to management he could not even touch a glass-making tool. For the historians, this was Charlie Tulip, who quickly became a trusted friend and colleague.
Max - this is your thread and it seems to be getting a bit off topic in spite of my valiant effort in the last para! I'm not clever enough to split threads, but if you or anyone want sort this out it's fine by me!