Ive managed to sort it, my prob was an error with the files in the textures/campmap/ files, I hadnt loaded an castle flags for the mod. I discovered the error using one of the threads I found on the site for making an expansion.

I was using established maps from the lordz napoleonic mod, so I knew the maps were sound, and avoided needing to manually set up regions etc.

Again thanks to you both for the help, this iste has added so much to my enjoyment of medieval.

May the Lord bring you both good health and many heirs