(b) any benefit shown to have accrued to the person responsible for the infringement as a result of it; is satisfied that effective relief would not otherwise be available to the plaintiff or applicant, the Tribunal or court shall have power to award such additional damages as it thinks fit. (4) Where in proceedings for an infringement of a registered trade mark it is established that an infringement was committed but that at the time of the infringement the person responsible for it was not aware and had no reasonable grounds for suspecting that he was not entitled to engage in the infringing activity, the plaintiff or applicant shall not be entitled under this section to any damages against that person in respect of the infringement. Anton Piller Orders 9D.—(1) If a person who has instituted or intends instituting proceedings for an infringement of a registered trade mark satisfies the Tribunal or a court that, prima facie— (a) he has a cause of action against another person which he intends to pursue; and