An update to my last post Alex - I added a test post directly onto the page using the Status Update option and made it available to the public but it does not appear in the Page Feed Menu on the site.
All the other posts were made using a Website App created by following the
JFB Facebook Application Setup Guidelines
although I noticed it was still in Development Mode so turned it on to live and all posts are now visible to the public when not logged into Facebook.
However none of them show in the Page Feed on the website.
It is a puzzle, probably something simple but I do not know what it is.