Nic ( the wife ) got kids citizenship first then went and got all three passports together as she had not held one before. You can get forms off
www.citizenship.gov.au download form 118 fill in and send with original documents plus certified photocopies it only took 1 week from sending but at a cost of £90 for 2 kids. You will find it easier than Nic as she had to send form to births,deaths & marriages in Perth to get her name changed as they wont except English marriage cetificate!!!!! That took 3 weeks and a cost of £84 .To get passoorts you need to go to the London ebassy in person and you need to make an appointment. Hope all goes well for you, if you need any more help let us know.
Jase, Nic, Emma(12) & Owen (6)