Hi Samantha,
Many thanks for your thorough and helpful comments.
Not much to report in terms of matters arising, other than to point out that I've included a note in the "Deleting a template" section. This clarifies that moving or deleting a template does not adversely affect a document that uses that template. The document will retain the styles that it originally inherited from that template. One slight quirk that I've mentioned is that the File > Properties > General page can indicate the name of a template that no longer exists.
The updated document is in the Draft folder, with all changes accepted, awaiting second review.
Regards,
Steve