Instead of upgrading minibb to be able to accept inline pics and so on I decided to implement a different, open-source editor. I settled for Summernote as it had all the features I wanted and was FREE - no add-ons costing dosh. The steps I carried out were these ...
Step 1: I downloaded the script and uploaded 2 of the files referred to in Step 2 to my server
Step 2: I altered main-post-form html file found in the templates directory to this ...
View main-post-form.html text file
That is all it took for the template files but as the images files are stored in the database I made sure there was enough room in each post by first of all altering $post_text_maxlength found in setup-options.php to this ...
Step 3: $post_text_maxlength=100000;
Step 4: Last but not least I altered the database post table, post_text field to medium text as opposed to just text to allow for far more characters.
Everything seems to be working - along with the editing side of things.