am curious as to how Acadia knows it is "grey" , you must of been a English grammar teacher i'd guess.

Grey is English
Gray is Americanised English

the only other one i know is:

Colour is English
Color is Americanised English

it's not that strange really as if you drive just 50-100 miles, sometimes less, from where you are anywhere in England, you will encounter a different English accent, and different pronounciation of words, i've always quite liked the different sounds of English accents but as a kid i'd pick them up quickly if i stayed anywhere for a week or two,so if i had been to Rotherham for a week then back in London i'd be saying "are we going down "tut" pub!" which roughly translates as "are we going down the pub"(LOL)