How to change Language settings in Pages

When i installed ipages 08 i made the mistake of selecting english instead of british english as my language setting. I was wondering if there is any way to change it permanently to british english, its driving me mad having american corrections. I know how to change the language on selected parts of text but wanted to know if i can make my default language british english as its really annoying having to change it for every document i make. I've tried moving iworks into the trash can and reinstalling it, but i never got the option to change the language.