The discretion to permit reopening of costs questions after judgment is untrammelled and not subject to a rigid 'exceptional circumstances' threshold; however, success on non-determinative issues in an appeal will ordinarily not constitute special or exceptional circumstances warranting departure from the general rule that costs follow the event. Parties who fail to seek leave to make further costs submissions under Practice Direction 3 of 2013 face a practical barrier but not an absolute bar.
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