Argument: Leaving will mean less communication with other security services

Leaving the EU may damage relationships with key security partners such as France and Germany. Both countries would have much less reason to cooperate on security issued when not in the same organisation. There would certainly still be some cooperation but the former heads of Mi5 and Mi6, Lord Evans and Sir John Sawers have stated that the UK would lose out through not being able “to take part in the decisions that frame the sharing of data, which is a crucial part of counter-terrorism and counter-cyber work”. Sawers points out that data sharing in the EU allowed France to transfer DNA and fingerprints of one of the Brussels bombers within months – previous to EU data sharing it would have taken months slowing down critical investigations. [1]

[1] ‘Row as ex-intelligence chiefs say EU membership protects UK security’, BBC News, 8 May 2016, http://www.bbc.co.uk/news/uk-36239741

Candidate 1: "The EU simply adds to an alphabet soup of organisations that work on security in Europe. The two which matter, NATO and EUROPOL, both have little to do with the EU and would work just as well with the UK out."
Candidate 2: "While keeping sight of the UKs national interests is important almost all of them can be carried out as well with the European Union as outside it. In particular the whole of Europe is interested in preventing terrorism. In other areas such as maritime security it makes sense for the UK to specialise in it while other countries specialise in other areas such as having larger armies. Moreover it should be noted that the UK is in one of the safest areas of the world with no hostile states in any direction. In this sense the EU is a buffer between the UK and less stable areas such as North Africa, the Middle East, or Russia so it makes sense to work with them as part of the same organisations including the EU."
Candidate 3: "In a letter to the Telegraph five former Secretary-Generals of NATO stated “The European Union… is a key partner for NATO” and that “Brexit would undoubtedly lead to a loss of British influence, undermine NATO and give succour to the West’s enemies just when we need to stand shoulder-to-shoulder across the Euro-Atlantic community against common threats”. They give sanctions imposed by the EU on Iran and Russia as examples of where the EU has lead on enhancing regional security. [1] Moreover if the EU is to create an EU force this will happen regardless of Brexit. Britain stands a much greater chance of stopping it when it has a voice in the EU with which to object.

[1] Lord Carrington, Javier Solana, Lord Robertson, Jaap De Hoop Scheffer, Anders Fogh Rasmussen, ‘Letters: At a time of global instability, Britain needs to stand united with its EU allies’, The Telegraph, 10 May 2016, http://www.telegraph.co.uk/opinion/2016/05/09/letters-at-a-time-of-global-instability-britain-needs-to-stand-u/"
Candidate 4: "Since the end of World War II Germany and national rivalries in Western Europe not been the main threat to Europe. Instead that threat has emanated from outside the EU; largely from Russia, and then from more nebulous threats such as terrorism. In both these cases it has been military alliances such as NATO and nuclear deterrence that have kept the peace."
Candidate 5: "If there were similar crises without the EU existing as a balm and place where all countries can talk regularly and confront problems together then the security situation would be much worse. In the past it has only taken small incidents to spark a war – usually exemplified by the assassination of archduke Franz Ferdinand starting off world war I, but there have also been wars started by trade such as the ‘War of Jenkins Ear’ which became part of the war of Austrian Succession. Today the EU provides a place to negotiate disputes between members making war between member states unthinkable. Of course war would still be a very unlikely response to a dispute, but leaving the EU would mean getting rid of one of the organisations that reduces that possibility by mitigating crises."
Candidate 6: "There would still be data sharing between Britain and its neighbours even if the UK left the EU. No intelligence agency would sit on information that could save lives in another country simply because that country is no longer in the same organisation. Moreover the UK could still negotiate data sharing agreements with relevant intelligence agencies to ensure that information sharing remains fast and comprehensive."
Candidate 7: "Control of borders is important. However it is also not relevant to the debate as the UK not being a party to the Schengen agreement already has control over its borders; the UK checks passports and visas at the border just as would happen if the country were to leave the EU. Leaving would make no difference to UK border security."

There would still be data sharing between Britain and its neighbours even if the UK left the EU. No intelligence agency would sit on information that could save lives in another country simply because that country is no longer in the same organisation. Moreover the UK could still negotiate data sharing agreements with relevant intelligence agencies to ensure that information sharing remains fast and comprehensive.
