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So how is the UK sovereign? It is subject to EU law.
Only because it says that it is.
Currently, is defers some of its sovereignty, in return for everything being part of a powerful trade bloc, and other advantages (and some disadvantages) provided by being a member of the EU.
It can easily say that it isn't, and there's nothing that Europe can do to prevent them (other than take away the UK's EU-provided toys).
Is that true? I don't claim to be an expert by any means, but as I understand it:
So how is the UK sovereign? It is subject to EU law.