Yeah Charlie is from one of those British ghetto places...Ireland or something :teehee

Emily De Raven (Claire) is from Melbourne. So, her accent is the real deal just that it sounds a little more pronounced among a cast with primarily American accents.

I think the only legit Australian accents (or actors) in the show have been Claire, obviously, the old dude from the farm that befriended Kate and the guy who sold the gun to Sawyer.