Alderney Agreement") entered into between the Governments of Alderney and of Guernsey, certain matters have been delegated to Guernsey. These are known as 'the transferred services'. Transferred services include policing, customs and excise, airport operations, health, education, social services, childcare and adoption. (The States of Alderney retains policy control of aviation to and from the island). In return for providing the transferred services Guernsey levies various taxes and duties on Alderney. From 2016 Alderney took back control of Tax on Real Property (TRP). Immigration is the responsibility of the UK (UK law applies), with day-to-day operations carried out by the Guernsey
Bailiwick of Guernsey was introduced above the "fiefs" and below the "Eschequier" Court in Rouen and comprised the Bailiff and four Knights; the court heard appeals and tried criminal cases. Otton de Grandson, then the Governor of the Islands, delegated the civil powers to two separate bailiffs for Guernsey and Jersey before he went on the Second Crusade to the Holy Land in 1290. This can be assessed as the date of first creation of the two Bailiwicks. Situated around , Alderney, Guernsey, Herm, Sark, and some other smaller islands together have a total area of and coastlines of about . Elevation varies