You must have at least "Permanent Residency of Australia" and a valid/uninhibited passport to fly anywhere on the network ie no restrictions on your passport. This includes domestic operations/MAM casual as you will be required to operate international flights. Good luck. You can still be employed on a foriegn passport but you must have the permanent residency status. Not sure about requirments for LHR, BKK or AKL base, only Australia base.