53Such rights to the repayment of sums of money the payment of which has been imposed by a Member State on a person in breach of EU law and to the payment of interest on those sums constitute the expression of a general principle of recovery of sums paid but not due (see, to that effect, judgment of 6 September 2011, Lady & Kid and Others, C‑398/09, EU:C:2011:540, paragraphs 18, 20 and 26).
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