Well, 12 months in advance for the new p/p does seem a bit of an overkill. Given the cost of an Oz p/p, you don't want to lose too much of it voluntarily ... 6 months in advance is already stretching it. Given that the process takes up to 4 weeks, I should think initiating it 2 months in advance should suffice.
Motto: Be prepared but don't die in a ditch.