British English

Could some kind soul please tell me this:

How do you coax Scrivener to spell check in British English as opposed to American English?

That is a system level setting, actually, but it can be set in any application that uses Apple’s spell-checker. In Scrivener, press Cmd-Shift-; to get into the spell checker tool, and from there you can set your preferred language, or form of it. Once you do that, it should be standardised throughout the entire operating system.

Cheers AmberV!

Just as a tip, I found I had to quit and restart Scrivener to get rid of the red underlining after switching to British English.

But it works perfectly now!