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Zaiwalla & Co successfully challenged the UK Treasury’s designation of Bank Mellat under the UK’s Iran sanctions regime in a landmark Supreme Court judgment. The case, recognised by The Lawyer as one of the top 10 cases of 2013, involved the first closed material procedure ever conducted in the Supreme Court. The Court held that the financial restrictions imposed on the Bank were unlawful and disproportionate. In parallel proceedings before the European Court of Justice, the firm also secured the annulment of corresponding EU sanctions. The case remains a leading authority on proportionality, judicial scrutiny of executive sanctions powers and the conduct of closed hearings in national security litigation.