In Australia all bread products are fortified with Iodine is this the same in NZ? Also breakfast cereals?

Yes like Australia it has been mandatory to fortify all bread products in New Zealand since September 2009. This includes all products made from bread dough that contain yeast and salt, which includes loaves, buns, rolls, pita, naan, focaccia, pide, bagels, topped breads, buns and rolls (such as cheese and bacon rolls), baked English-style muffins, sweet buns, and fruit breads or rolls.
With breakfast cereals it is not mandatory to add Iodine to these products although some companies choose to as a point of difference for their product. Therefore you will need to check the ingredient lists on these products to confirm whether Iodine is present.