Claim form - Service - Defective service – . The respondent and its solicitors had not been under a duty to notify the appellants that their purported service of the claim had been ineffective. The Court of Appeal, Civil Division, held that the judge had been right to find that a Master had erred in finding that the respondent's solicitor's conduct in failing to inform the appellants that its service had been ineffective had outweighed the appellants' mistake .