LaTeX-Plugin 0.2 (not RC3!) installed manually on Ubuntu 10.04, TeXLive 2009
With standard option "de_DE" in Configure LaTeX Plugin>Miscellaneous>Sprache the Spell Checker works as expected. But if changed to "en_GB" it just fizzles: when choosen in the menu LaTeX>Spell Checker nothing happens and the Context Menu doesn't change. Note: spellchecking plugin native to gedit works with both languages.