Quote: "1-What's shipping cost like from UK to Oz?"
I don't know and I'm guessing that it's not cheap.
Quote: "2-Will it get past customs?"
Assuming they don't eat them, maybe but I'm not sure.
Quote: "Satisfactory answers may mean you get your wish but only because you designed some of the levels"
Don't worry about it mate, I hope to make my way to the UK at some point, visit the various regions and accents, might even make my way to Derby; I'll try them then.

Making those levels was a treat for me, if there's one thing more fun than playing a game, it's making it.