Thank you Macropod, I will do some more testing with that option out. Generally, the templates (i'm building 150 templates) will be sent outside of the organisation, to be typed up and then come back in-house to be finalised before PDF'ing and sending out. Therefore, the connection to the template will be lost.

The reason I asked about restricting the document defaults was that I was given an example document, which had changing of theme/colours/fonts restricted, plus when I clicked on the 'Paragraph Spacing' button, the only option was 'Custom Paragraph Spacing'. That gave me the idea. Although, I now realise that even if this feature was turned off in that place, there is nothing stopping the user from changing it in the Home > Paragraph options. It therefore it is pointless trying to restrict it. Sorry for wasting your time - too many different places to change the same thing and I forget where they all are! As i'm coming across things, I've more ideas coming to mind on how to handle all these templates and make sure styles are kept up to date, whilst making it as easy as possible on the end user.