Executive authority is vested in the Queen, who is represented in the territory by the Governor of Saint Helena. As the Governor resides permanently in Saint Helena, an Administrator is appointed to represent the Governor in the islands. The Administrator is a career civil servant in the Foreign Office and is selected by London. Since 1998, each Administrator has served a single, three-year term (which begins in September, upon arrival of the supply ship from Cape Town.) The Administrator acts as the local head of government, and takes advice from the Tristan da Cunha Island Council. Alex Mitham was appointed Tristan da Cunha’s 22nd Administrator and arrived, with his wife Hasene, to take over from Sean Burns in September 2013. The Island Council is made up of eight elected and three appointed members, who serve a 3-year term which begins in February (or March).
Try to answer this question if possible (otherwise reply "unanswerable"): What is vested in executive authority?
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