Dispute resolution analysis: A claim for damages for negligence and breach of contract against former solicitors formulated on the basis that, had they performed the contract or acted without negligence, the claimant would either not have been convicted or the penalty imposed by the court would have been less severe, was a collateral attack on a final decision of a court of competent jurisdiction and should be struck out. Where, however, a head of claim did not include, as an essential element, an allegation that the outcome of the criminal proceedings would have been different, then that claim was not an abuse of process and should be allowed to proceed. This decision of the Court of Appeal provides further guidance in this difficult area of law. Written by David Fisher, barrister, at New Square Chambers.