Dispute Resolution analysis: The Court of Appeal held that section 70 of the Solicitors Act 1974 (SA 1974) should be construed in light of the Court of Appeal decision in Re Clark—the later decision, In Re a Solicitor, having been decided per incuriam. The provision therefore applies to all costs subject to the solicitor/client costs assessment, including those which were claimed, but which were not part of the solicitor/client retainer, and therefore were disallowed during the assessment. It also held that when making a costs order following a costs assessment, if the costs judge determines that ‘special circumstances’ apply then, under SA 1974, s 70(10), the costs judge exercises their discretion and in doing so may decided not to apply the one-fifth rule in SA 1974, s 70(9). Further, special circumstances do not need to be exceptional. In this case, the fact that the client was a solicitors firm was seen by Lady Justice Arden to constitute a special circumstance.