Thanks.
I’ve sorted that now in the CMS connections - it all works quite well, not as smoothly as the site I referenced above, but it does the job and loads the images quickly.
The only last issue. which I hadn’t really noticed on websites before, is when hovering over various parts of a page tool tips appear and URL info. in bottom left of screen. I’ve checked this on another computer and it also happens. I hadn’t really noticed it before.