It's completely free for a UK passport holder to get an Aussie eVisitor (class 651). It usually comes through instantly and and it's valid for a year.

> One World recognizes and rewards all flightsNot always true - Qatar Airways flights in cheaper fare buckets often don't yield any points or status credits, which is pretty disheartening if you do a return to Europe!

Like @Brassy, mine also just came through (applied on 12th Sept). No email confirmation, but noticed I was updated to Gold when I checked the app :) Expires end of March 2019.

I'm a QF Gold too and sent my details in on 12th Sept. Haven't had a "promotion now closed" message, so hopefully they're still working through the backlog.