“There can be no doubt that on9 February 1983 the Registrar had no jurisdiction to make the consent order because it was made before decree nisi… However, it is well established that an order of a court of competent jurisdiction which is good on its face must be treated as a valid order until it has been set aside (see the observations of Lord Diplock in Isaacs -v- Robertson[1984] 3 WLR 705 , the report of which, unfortunately, only became available after the conclusion of the argument in this court). Consequently the wife should have applied to the court to set aside the order as the first step. Had she done so the court would have been obliged to set it aside ex debito justitiae. Counsel for the husband was right in his submission that until set aside the consent order was an effective bar to his wife’s subsequent application for financial provision, but wrong in his contention that the only remedy was by way of appeal or judicial review… The order for trial of a preliminary issue was itself misconceived and in the result led Ewbank J into error. An order made without jurisdiction which one party is entitled ex debito justitiae to have set aside cannot possibly be saved by the slip rule or by the inherent jurisdiction. Once the court’s attention is brought to the fact that the order was made without jurisdiction there is no alternative but to set it aside. Counsel for the husband submitted that the order had been acted on to the extent of handing over the car and that the wife was estopped from challenging the validity of an order. It is, however, well settled that jurisdiction cannot be conferred by consent or estoppel. Moreover, any person who might be affected by such an order is entitled as of right to have it set aside.”