Many thanks, Jim and Dogtrack, for your suggestions.
No UTX, ORBX or FTXG installed I'm afraid. I can't be sure whether or not I had the Western Isles layering correct and I haven't tried re-installing it yet thinking I should get installations of Volumes 1 and 2 working properly before installing anything more.
Having now read the image uploading rules and realized my jpegs were a few hundred pixels too wide I shall have another go as seeing the effect might be more useful than a wordy description.