The UK-based think-tank UK in a Changing EU has published the results of a study in which its authors outline what they believe a successful Brexit would constitute with regards to Britain's overall security policy.
National Security
According to the report's authors, the best-case Brexit scenario for the country's national security is one that maintains in place the institutional arrangements for fighting terrorism and organized crime across the continent. This would involve maintaining full membership of Europol as well as the European Arrest Warrant System, which enables law enforcement to pursue suspected criminals across the borders of signatory countries.
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Of particular concern has also been the status of Britain's territories beyond the country's English core, notably Northern Ireland, Scotland and Gibraltar. The report advocates that any final settlement between London and Brussels must leave the political status-quo of these territories in place so as to preserve the continued unity of the United Kingdom. Scottish nationalist tendencies have been combatted in recent decades by the process of devolving government powers to Edinburgh, while the armed conflict in Northern Ireland came was brought to an end in the late 1990s with the institution of the frictionless border between the UK and the Republic of Ireland.
International Influence
Britain contributes significantly to the military weight of Europe as a whole, leading the authors to conclude that the UK's combat capacities will not be seriously affected by it's exit from the EU, especially given its continued membership of the North Atlantic Treaty Organization and its so-called "Special Relationship" with the United States.
Control
One of the key factors motivating the Leave Campaign in 2016 was the objective of "taking back control" of the UK's borders and becoming once again a distinct legal jurisdiction from the Continent. Similarly having exclusive control over the formation of its own foreign policy has been a primary concern, particularly to the so-called Hard Brexiteers.
The report's view of a successful Brexit in this respect would entail Britain maintaining its autonomy in shaping future global initiatives and institutions such as measures to tackle climate change and maritime trafficking.