Thanks for the guidance!
I have installed the suggested pluggins however, between Users, Restrictions, Roles and UAM (User Access Manager) I can't "see the wood for the trees".
I have setup a User called 'user' assigned to a role of 'WP Editor' and all I want is to allow this user /user group to view/read the posts/pages within the editor but when they try to make changes and update and/or move posts and pages to the Trash they are prevented from doing so! But at the moment I only seem to be able to allow full read and write access or not be able to view any content.'##';#';#';
I will have to waste more time later tonight.... reviewing /setting-up the access premissions again.