I believe that any halfway decent actor if given proper vocal coaching can pull off any English (British, Australian, American,what have you) dialect convincingly. Usually we are better fooled if the person is an unknown and we have no reason to believe that they don't not natively speak the dialect.
For example Gary Oldman plays many roles as an American if you did not know that he was in fact British and only saw him in those roles you'd be certain that he was American or Canadian.
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