For anyone who stumbles upon this thread looking for a timeline for Australian Police Certs.
27/09/14 - Application posted to Australia via Royal Mail International Tracked
09/10/14 - Payment taken off credit card - $99 or £56
16/10/14 - Email Received from the Australian Federal Police to say that they are posting the certificate
22/10/14- Certificate received in the post.
25 days in total. 18 working days.