Well I think I am doing it correctly :-/
I have added the macro into the document file name Q0340-Coppice.docx, and run it from that window.
It display "Normal" in the popup MSG box.
The file was created with a document template which should be \\SERVER\templates$\mytemplate.dotx. This path is no longer available, nor the template (although I have a copy of a slightly amended template which I am trying to attach, with the same filename.dotx.