You asked
I would like to make a Freedom of Information request for this 1938 Home Office (Factories Inspection Department) Register, either in print or as an electronic file.
We said
Thank you for your Freedom of Information request. Unfortunately we do not hold the information you require. The information you are referring to indicates the original data was obtained from the Home Office. We would therefore suggest contacting the Home Office who may be able to assist in this matter. We are sorry that we cannot help on this occasion.