Originally Posted by Damien

Why wouldn't change our laws? It's can be part of a trade deal. Maybe if we want to deal with american financial services we may have to have a bunch of laws detailing how data is dealt with, how we report it and so on. There are many other times that this is the case as well. We give up some degree of control when we join bodies such as NATO, the UN and the European Convention on Human Rights.

The more commitments you make to other nations or international bodies the more you're bound up those commitments. You've removed some ability to act completely independently but have gained something in return.

You talk about sovereignty as if it were a singular thing which you ever have or you do not have. In reality hardly any nation is completely sovereign in the sense you seem to mean, i.e completely free from outside influence, but we are sovereign in the sense we can opt out of any of these examples when we want - including the EU - if we're willing to accept the consequences.