sentences:  The island is a self-governing Crown Dependency, part of the Bailiwick of Guernsey since Elizabethan times.Certain services, known as 'transferred services' are provided in Alderney by the Guernsey Government under an agreement entered into between the States of Alderney and the States of Guernsey in 1948 ('the 1948 Agreement').Defence and foreign policy are reserved to the Crown, which in modern constitutional terms means the relevant United Kingdom government departments (the Ministry of Defence and the Foreign and Commonwealth Office.