Main Dictionary Language - Studio '13

Recently upgraded from Studio '09 to '13 and in creating my first few courses all words have been underlined for spelling errors. Frustrating. I went to the Articulate Options and selected Spelling, Spelling Options and there is no English UK option in my dictionary list. How can I get this changed/updated, etc.?

Screenshot of my options attached. This is for Quizmaker, Engage, etc.

Thanks