Thanks for this zaphodeist, I couldn't get anywhere with upgrades, and so I have upgraded to Pro X9 in the meantime.
With the new version, I have managed to successfully publish the modified page, but unfortunately I have 'lost' a raft of images (3) at the base of the page, together with the lower portion of the new image!
You can see the index page in question at www.britainswalks.co.uk. The missing lower section contains 3 images.

Any further ideas please?