The links you have noted explain how to insert a category icon in the Post Title or even within the meta data line. This isn’t quite what I am after. I’m trying to get category icons to display within the body of the post itself – top left hand corner.
Once again : you are free to put the images/icons wherever you want, as the plugin only suggests you where to put the icons, for the beginners. Just put the get_cat_icons() function where you want in your template file, and if necessary, apply some css to the icons/images by using the class parameter.