Same-sex marriage in Guernsey changes to other laws are approved by the States at its meeting on 26 April. On 26 April, the States approved both ordinances, and the law took effect on 2 May 2017. It applies to the jurisdiction of Guernsey, but not to Alderney and Sark. Alderney, one of the three constituent Channel Islands which form the Bailiwick of Guernsey, has full autonomy in most legal matters (except foreign affairs and other powers that have been transferred to the States of Guernsey), through the States of Alderney. Same-sex marriage is legal in Alderney. On 21 February 2017, the States of Alderney's
External relations of Guernsey bodies such as the EU or the OECD. As a result, the crown dependencies work together on areas of mutual interest. For example, in 2000, the three states cooperated on development of common policies for offshore banking. In 2003, they developed a joint approach to certain EU activities around tax information. The heads of government of the crown dependencies, including Isle of Man, Guernsey, Alderney, Sark, and Jersey, meet at an annual "inter-island" summit, to discuss matters of common concern, such as financial regulation and relations with the UK. The relationship of the Crown with Guernsey has been set out