Composition of the group

Albania, Andorra, Australia, Austria
Belgium, Bosnia and Herzegovina, Bulgaria
Canada, Croatia, Cyprus, Czech Republic
Denmark
Estonia
Finland, France
Georgia, Germany, Greece
Hungary
Iceland, Ireland, Israel, Italy
Latvia, Liechtenstein, Lithuania, Luxembourg
Malta, Monaco, Montenegro
Netherlands, New Zealand, North Macedonia, Norway
Poland, Portugal
Romania
San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland
Turkey
Ukraine, United Kingdom

Observers: Parliamentary Assembly of the Council of Europe, European Parliament

A list of the websites of National Parliaments can be found on the IPU website:  Websites of National Parliaments

The IPU website also provides a database on national parliaments, containing information on the structure and working methods of the parliamentary chambers in all of the countries where a national legislature exists: Parline, database on national parliaments