There are plenty of complaints/queries (on this forum too) about how to set the default Language in Mac Word from English (US) to English (UK). I've tried the lot but Word is a stubborn animal. And despite employing all the suggestions (and Word indicating that I have done the right thing) the "s" in "analyse", for example, is still red-lined as incorrect and suggest the US version.
A Nobel prize for someone who knows the definitive answer!
A Nobel prize for someone who knows the definitive answer!