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Yes it is in matters of common interest.
But all international law takes precedence over national law. By definition.
Like all member states, the UK has a say in the making of European law.
And it can give us real benefits.
Take British beef. The EU approved its sale in all member states. France resisted but its objection was overruled by the European Court.
Many Commonwealth countries refuse to sell British beef. We can do nothing about it.