One of my clients came today for a trim up and told me they sat the citizenship test a few months back and were waiting for the ceremony. Her hubs had to go out of the country for work and was told, "You are not a citizen till you have the ceremony" So he thought the PR visa in his english passport would be ok to come back in on. When he arrived at the airport overseas to get on a plane back to ADL he was told his visa had expired! The lady could only get him a temporary holiday visa, he has since had his ceremony and applied for his australian passport.
I am posting this in case there are any of you out there going overseas between doing you citizenship test and attending your ceremony