It may be but that is not the point. As a British English person I would never speak to an Australian in Australian slang. That would appear to be stereotyping.Thank you, Biffo. I thought of it as an Australian colloquialism.
Agreed. At a formal occasion, do not use colloquialisms of any kind whether they be British, American, Australian or whatever.Apart from the issue mentioned by Biffo above, it would be completely out of place for a prospective employee to go to an interview and say 'You alright, mate?' to the person interviewing him