This is the answer to my query - I couldn't find it here easily and so, even for my own future reference I add this note.

Button Missing - no block text in FCKeditor

FCKeditor has more functions available than are shown - one is block text. Try search for it and even in FCKeditor they use two different terms for the same thing - remember JustifyFull and

What to do?
http://docs.fckeditor.net/FCKeditor_2.x/Developers_Guide/Configuration/T...

you need to open the file /sites/all/modules/fckeditor/fckeditor.config.js or your custom configuration file for FCKeditor and do this:

add 'JustifyFull' to the line
['JustifyLeft','JustifyCenter','JustifyRight',],
to look like this
['JustifyLeft','JustifyCenter','JustifyRight','JustifyFull'],

- same applies for other functions.

For using Spell Checker in FCKeditor under Firefox - see http://drupal.org/node/382784

Good luck -