I think there have been occasional messages on various lists about wartime
munitions factories of various sorts because of family members working in
them. English Heritage have made this excellent book available for free
download. It has a lot of information on the various types of manufacturing
and a comprehensive gazetteer at the back of the book.
It includes Wales.
Cocroft, W. (2000)
Dangerous Energy: The archaeology of gunpowder and military explosives
manufacture. English Heritage.
http://archaeologydataservice.ac.uk/archives/view/eh_monographs_2014/content
s.cfm?mono=1089008
http://goo.gl/iJ20r9
For anyone interested in history they have also made many other publications
available.
http://archaeologydataservice.ac.uk/archives/view/eh_monographs_2014/
http://goo.gl/lrzkLf
Martin Briscoe
Fort William
martin(a)mbriscoe.me.uk