I am trying to remember more of what was in that ad. You would be in charge of the factory at night and would be in charge of factory maintenance teams etc if I remember right.
I will ask my father if there is anything going at his factory in Bristol. He works for Mathew Clark or what ever they call themselves this week at Whitchurch. He is a maintenance fitter and like you has always worked in food and drink. Its worth a mention im sure.