which derive from the Treaty of Establishment." It also argued that the UK does not have territorial waters in the areas. The UK government does not recognise Cypriot claims that the UK's sovereignty in the areas is limited. In July 2001, protests were held at the bases by local Cypriots, unhappy with British plans to construct radio masts at the bases as part of an upgrade of British military communication posts around the world. Locals claimed the masts would endanger local lives and cause cancer, as well as have a negative impact on wildlife in the area. The British and Cypriot governments jointly commissioned health research from the University of Bristol and the Ministry of Health of the Republic of Cyprus, and that research project reported in 2005 that there was no evidence of health problems being caused by electromagnetic fields from the antennas. The Sovereign Base Areas Administration has carried out assessments and surveys into the effects on wildlife, which have fed into an "Akrotiri Peninsula Environmental Management Plan", published in September 2012. In 2004, the UK offered to cede of farmland as part of the rejected Annan Plan for Cyprus. On 29 August 2013, during the Syrian civil war, some Cypriot and British media sources speculated that long-range ballistic missiles, fired from Syria in retaliation for proposed British involvement in military intervention against the Syrian government of Bashar al-Assad, could hit Cyprus, and could potentially deliver chemical weapons. In some Cypriot media it was stated that the proposed interdiction of the Syrian civil war, utilising Akrotiri and Dhekelia, could recklessly endanger the Cypriot populations near to those bases. Two days earlier, on 27 August 2013, Cypriot foreign minister Ioannis Kasoulides had moved to calm Cypriot concerns, saying that the British bases were unlikely to play a major part in any intervention. Travel documents There is normally no passport check at the border from Akrotiri or Dhekelia to Cyprus. Possession of a passport, or an EU-compliant national identity card is generally needed in Cyprus. A passport is required to travel between Cyprus/SBAs and Northern Cyprus. Issues concerning the validity of car insurance and customs are specified by SBAs' administration. Brexit implications Under Article 2(1) of the Protocol, the SBAs are partially part of the European Union Customs Union in three domains: VAT, agriculture and fisheries. However, the SBAs are already outside the EU. Therefore, concerns have been raised about