Thanks for your response Macmanx,
Unfortunately I didn't describe my problem correctly and this is, I hope, a better description .
I previously uploaded all my Photos (individually) - to be placed in various groupings - on their respective Pages. Newer Photos being placed within these groups wherever appropriate.
As I wished to use separate lines of Text between these Photos, from time to time, I decided not to use "Gallery".
However I used the [slideshow] shortcode at bottom of each page.
I positioned my Photos to appear, in the order I wanted them to appear within the Slideshow, from the Edit Page.
After clicking on Edit Image and I clicked on Media Library which brought up Thumbnails of all the Photos related to that Page.
Then I could Drag and Drop my Newly Uploaded Photos into the order I wanted them to be seen before updating and Inserting in to Slideshow.
Now I can't seem to do this.
My Slideshow still works but newly uploaded Photos get placed at either the beginning or the end rather than in their proper place within their related group.
This can be seen on the Staff Events - Club page where my latest uploaded photo appears - within a Red Border, sixth place down the page - but not in the correct place in the Slideshow.