In terms of other jurisdictions, there are variations in what I would call Westminster-style parliaments. The regimes in each of the countries that you consider—United Kingdom, Australia, New Zealand—all vary. In the United Kingdom the House of Commons is subject to access to information legislation. I know of a court case going on right now in New Zealand over an access to information request, where the New Zealand House is taking a position similar to the one taken in our House.
Richard may have more to say about the legal regimes in other countries but that's just an example of the variation that exists. It's very difficult to compare directly.