Iranian Bank Mellat appealed against a decision upholding measures taken by the Treasury to restrict its access to the UK financial market. The Treasury had directed that all persons operating in the UK financial sector were prohibited from having any commercial dealings with the Appellant or its UK subsidiaries. The Appellant argued the Treasury had failed to give adequate reasons for its decision. The High Court and Court of Appeal both dismissed the appeal, however the Supreme Court allowed it. One of the central issues raised was that the lower courts found that the justification for the order was not a problem specific to the Appellant, but a problem with Iranian banks in general. However, the order made no attempt to impose restrictions on other Iranian banks. In that regard, the measure was arbitrary, irrational and disproportionate. The order was also found to be invalid on various procedural grounds.