jim; //Anyhow, the UK/Japan Trade Deal runs to around 1000 pages. It's an agreement to work together. If you work together then you are ceding at least some level of sovereignty, clearly, because that means allowing the other nation to have some say and some influence in the decisions you make.//
This is complete nonsense, if British businessman, Mr Smith wants to trade with Japanese businessman, Mr Watanabe, the subject of their discussion is a deal in trade, no form of sovereignty is in anyway involved.