the Spanish Succession. In that treaty, Spain ceded to Great Britain "the full and entire propriety of the town and castle of Gibraltar, together with the port, fortifications, and forts thereunto belonging ... for ever, without any exception or impediment whatsoever." Should the British Crown ever wish to relinquish Gibraltar, a reversion clause holds that the territory would first be offered to Spain, "And in case it shall hereafter seem meet to the Crown of Great Britain to grant, sell or by any means to alienate therefrom the propriety of the said town of Gibraltar, it is hereby agreed and concluded that the preference of having the sale shall always be given to the Crown of Spain before any others." Furthermore, the Treaty stipulates "that the above-named propriety be yielded to Great Britain without any territorial jurisdiction, and without any open communication by land with the country round about" (although there is dispute over whether this disclaims territorial jurisdiction over Gibraltar, or over the "country round about") and that no overland trade between Gibraltar and Spain is to take place, except for emergency provisions in the case that Gibraltar is unable to be resupplied by sea. The British Government and the Government of Gibraltar have argued that the membership of both Gibraltar and Spain in the European Union (EU) — Gibraltar was included as a Special member state territory when the United Kingdom joined the EU in 1973; Spain joined the EU in 1986 – superseded such restrictions as the EU is committed to free movement of goods and services. The effect of Brexit on Gibraltar is unclear. Differing positions The United Nations regards Gibraltar as a Non-Self-Governing Territory administered by the United Kingdom of Great Britain and Northern Ireland. Its report of February 2016 sets out the differing views of the various parties relating to Gibraltar. The Gibraltar Constitution Order 2006 (UK) established a form of government for Gibraltar, with the Governor of Gibraltar being responsible for the conduct of external affairs, defence, internal security and for certain appointments to public office, and the Government of Gibraltar being responsible for all other matters. The UK believes that as an independent territory, recognised by the United Nations, Gibraltar enjoys the individual and collective rights that are set out in the 2006 constitution and the right of self-determination. Spain disputes the legality of the 2006 constitution and claims that it does