Thanks, I've tried to locate info about Cessnock Budgie (Budgerigar) Club, unsuccessfully. There is a post in this thread (http://forums.budgiebreeders.asn.au/index.php?showtopic=31039 ) by Maddy, where the CBC leg band is referred to so I assume it exists.
NSW Budgerigar Society only lists Newcastle and Central Coast Branches.
I am about to email the NSW Ring Registrar, Barbara, so I'll post here the result of this inquiry.