Sorry guys I didn't get to speak to the guy very long so I can't give exact detail, he did mention when he was a recruitment officer it was before private recruitment companies were involved (I'm guessing Locher) so it may have been 20 years ago and the info may be useless.
If they did interviews over the phone I wonder if they would change the process then as Airservices Australia do their process as follows:
1) Application,
2) Maths, English and Psych tests online,
3) Phone interview,
4) Pat 1, Pat 2 equivalent, medical and interview with recruitment board on one day.