Rich Text Editor Filters
These filters modify the configuration of the rich text editor.
mce_spellchecker_languages
applied to the language selection available in the spell checker.
mce_buttons, mce_buttons_2, mce_buttons_3, mce_buttons_4
applied to the rows of buttons for the rich editor toolbar (each is an array of button names).
mce_css
applied to the CSS file URL for the rich text editor.
mce_external_plugins
applied to the array of external plugins to be loaded by the rich text editor.
mce_external_languages
applied to the array of language files loaded by external plugins, allowing them to use the standard translation method (see tinymce/langs/wp-langs.php for reference).
tiny_mce_before_init
applied to the whole init array for the editor.
@OrganicBeeMedia - That’s just what I finished following and managed to get it working and customise it. Thank you for all the help but that tutorial took a bit of searching but it’s what I needed in the end.