Five Nations Passport Group
The Five Nations Passport Group is an international forum for the passport-issuing authorities of Australia, Canada, New Zealand, the United Kingdom and the United States to share best practices in the issuance, development, and management of passports. The annual Five Nations Passport Conference is a largely informal in-person meeting between officials of the participating agencies, with some additional invited guests such as the Irish Department of Foreign Affairs and Trade in 2011.
Source: Wikipedia — Five Nations Passport Group (CC BY-SA 4.0)