How would you describe New Zealand's government?

Answer 1

New Zealand only has a single chamber government, and the Prime Minister is chosen by the leading political party in the Parliament.

There is no easily available single document covering constitutional matters, and the Government of the day has very broad powers, with little trammel.

One curiosity of elections in NZ is that any resident with sufficient length of stay is entitled to enroll as an elector and vote in the general elections. As has been pointed out - even the Marine Guards at the American Embassy! Voting is not compulsory.

In recent years, NZ has had an MMP style of election, where each voter casts two votes, one for a regional candidate, and one for a political party. One half (roughly) of the seats in Parliament are occupied by the nominees of the political parties.