Spell check does not recognize British words due to incorrect format.
Cause:
The text is not formatted as English (UK).
Solution:
Select the British text, and format it as English (UK).
1) Select the text to be formatted in British.
2) Select the 'Tools' menu and select 'Language...'. (The Language dialog box appears.)
3) Select 'English (UK)' from the 'Mark Selected Text As' list box.
4) Click 'OK'.