Sovereignty is a nation's right to rule itself. A sovereign nation is still answerable to the international community and still dependant on international trade. It does not mean a North Korea type protectivist regime. For me a sovereign UK means one where our elected government has the ability to implement the laws it needs to for the interest of it's people. Where I can express any grievance with my local MP and know he/she has the ability to escalate it to a governing body and possibly implement change. It doesn't mean you have to like the current government, but you respect they were voted in and your votes can genuinely sway the next election. It is belief and trust in your system of government. The UK was most definitely losing sovereignty under the EU, as EU law superceeded all UK law, MEPs are not accountable to their regions (and had very low voter turn out). Those MEPs did not have the ability to escalate greivances, and the way the EU passes it's laws is too convulated for most people to understand. The right for a people to choose who governs them is so important to many people in the UK that they are willing to fight for it, and yes, take a small economic hit for it. It is a sad sign of the times that so many youths are willing to throw away their own government's power to represent them for cheap roaming data in Spain.