Paul

The class associated with the links on the two pages in question are different than on any other page on your site.

Change the class on the properties for sale page to menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-38 current_page_item menu-item-146 and on the properties for rent page to menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-38 current_page_item menu-item-156

That should take care of your problem.

You will need to edit your footer.php file (or the file where you inserted this image). The html for your image needs to be moved down to the line above this <div id=”cboxOverlay” style=”display: none;”></div>

The current width is limited by the <div> tag that the image is inside of and by moving it outside of the tag (after the </div> tag) it removes this limit.

You can then delete your width modification or change it to 100% so that it fills the screen as you desire.

Have you tried updating to the newest version (Version 1.9)?

It looks to me that your site is trying to reference back to your test site. Double check that your theme is loaded correctly. It should be in https://www.newtechtools.co.uk/wp-content/themes

You could try using something like Full Screen (Page) Background Image Slideshow. I have not personally used it but the screenshots look like it might be what you are looking for.