Thanks very much for the hack for /mod/wiki/weblib.php and the css file - that will do fine for now.
But as a result of you pointing me in that direction I realize two things.
1. That Safari probably puts the dragable re-sizer in by default, but Firefox does not, and,
2. That the upgrade to nWiki didn't add a couple of fields to mdl_wiki which I think should be 'editorrows' & 'editorcols'.
This probably means a few other things could be ary with my install, and I had better go back and check what!
But I wont stir up any more ire on that score!