Max Pete, your scenario wouldn't happen. An employee is an employee regardless of origin.
AA, Skycruiser, Agamemnon, all pilots working in the UK have either a British passport or right of abode. Therefore they have a right to be here. You can get an Australian passport if either parent is born there. There are many British born pilots in Australia. As you may know Ansett has folded. Would you like all those experienced pilots to come home?
I have worked with American, Canadian, English, Scottish, Welsh, Kiwi, French, German, Swiss and Italian pilots in Australia. If they have the right to be there, whether be by marriage, emigration or dual citizenship and they can do the job then they are welcome.