Yes, we're Irish non resident.
Thanks for that Domo - I'll pm you about this.
Meeting with an accountant on this side next week. He mentioned the following;
Once you become Australian residents, then Australian tax law effectively
assumes that you have purchased the properties for their market values when
you become residents. You will be able to claim any losses you have made on
the properties against your other income.
If you lived in one of them before moving to Australia, you may still be
able to claim the principle place of residence exemption on that one as you
are still renting in Australia.
The foreign tax treaty Australia has with Ireland should mean that there is
no Irish tax payable on the properties once you become Australian residents.