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I assume this was directed to me.
1) It (the EU) has been given the right to enact these laws by the member state. The source of the power remains attached to the member state. 2) The bodies which do this include officials either elected by the public of the member state (Parliament) or appointed by the elected officials of the member nation (Commission). 3) The member state can revoke these powers (see: Brexit).
It is an international treaty at the end of the day, not a federal government. If a member state does not want to comply with a law, it doesn't have to. There is no power which can enforce decisions made by the EU.
Having said that, there is certainly a democratic deficit with the EU.
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.