Hello. I believe you have quote from the English Act. The Scottish Act and the Treaty itself give a different picture. For example, article VI says "That all parts of the United Kingdom for ever from and after the Union shall have the same Allowances, Encouragements and Drawbacks, and be under the same Prohibitions, Restrictions and Regulations of Trade and lyable to the same Customs and Duties on Import and Export." Hope that helps! 86.153.144.192