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First, I'm not a lawyer. You should really clarify with your Legal Counsel.
That being said, you need at least one address that is tied to your company where someone could send a note saying "Unsubscribe me". This is universally true around the world.
My preference is to display the local address if available using Snippets by Country or Country specific templates. I've worked with the UK alot and am pretty sure your address must match your Registered address or at least one main office registered in the UK, if such an office exists.