I'll kick us off and then defer to my colleagues.
In terms of a regulator, I think there's a spectrum of options. I note that in New Zealand there is a postal contract system set up between the government and the postal delivery. It establishes a set of commonly agreed upon goals and objectives, including those that we've been framing as the public service side of things as well as the more financial sustainability side of things.
It doesn't necessarily have to be a hard regulator like we might have in broadcast. It could be more of a formal process that sets and reviews certain annual or five-year goals and outcomes.