“37. … As in the case of prohibitive injunctions, it must in my view be permissible as a matter of law for the court to make successive mandatory injunctions requiring positive action, such as the disclosure of information, notwithstanding a past failure to comply with an identical request. A failure to comply with any fresh order would properly expose the defaulter to fresh contempt proceedings and the possibility of a further term of imprisonment. 38. While such a course is legally permissible, the question of whether it is justified in a particular case will turn on the facts that are then in play. It will be for the court on each occasion to determine whether a further term of imprisonment is both necessary and proportionate.”