British Dictionary
I finally looked up how to stop it (without right-clicking on each word and having the Mac learn it).
If you’re British too and want to banish those red underlines. Here’s what to do:
Open System Preferences and select International.
Click on Edit List...
From the drop down window tick British English and
press OK. Make sure: Order for Sorted Lists, is set to
English.
Log out or restart and you’re done.
Update: A much quicker way comes from Christopher Phin
of MacFormat:
“...an easier way to
switch to British English is
to right-click on any word, choose Spelling and Grammar
> Show Spelling and Grammar and then switch from
'English' to 'British English'. Hardly obvious, but an
essential tweak for a new Mac!”
I
don’t think I’d’ve ever found that
one. Thanks to him.