Hello.
I see that nearly three weeks have past without suggestions. Perhaps if you haven't already, you could read the first few locked posts at the start of each subject board, [eg this board Renfrewshire, Scotland] as they offer advice about research options, in that area of research. You can also read some of the already posted threads, with titles of interest to you, looking for tips. Also try the search option from the top bar, to see if others have researched that work place.
Then start a thread with a nominated named subject [person or building etc], area, and date/year and someone will come forward with tips from their research experience.
- Alan.