https://www.washingtonpost.com/world/europe/paris-attacks-reveal-fatal-flaws-at-the-heart-of-european-security/2015/11/28/48b181da-9393-11e5-befa-99ceebcbb272_story.html
Perhaps you should read this.
They say our security will be at risk if we leave the EU. Well we was in the EU when the IRA was bombing British cities. We was in the EU when the 7/7 outrage took place. EU security didn't shine too brightly last year in Paris did it? Our security at risk if we leave EU? Absolute nonsense.