From what i know, by next year or 07 all pilots and controllers have to undergo an aviation english course to ensure the obvious.
qcode, I had heard the same; even people with english as their first language will have to sit the 'test' (then do the course if they fail).
ICAO rule pending, or something like that. There are a few colleges setting up 'aviation english courses' down this end of the globe; hoping to cash in on the Asian market. Maybe get a few kiwis to do it too
I still chuckle every time they read back FL360...