The parties may also challenge the validity of an arbitration agreement on the grounds that it is null, void or incapable of being executed in accordance with Section 20 of the Court of Appeal and that it has confirmed the agreement. The use of the word “operation” shows that the airline has agreed, in terms of construction, to fly the aircraft commercially – thus providing a passenger service. The contract, which was read as a whole, also showed that the aircraft had to take off and land at the airport on each operating day. If it could not do so for technical reasons, it would not cause the airline to break up. In addition, the frequency of flights or the destination of flights was the responsibility of the company. This case is another example of the Court of Appeal disagreeing with the judge and finds that the contract was ultimately enforceable. The application of this rule is illustrated by Sudbrook Trading Estate Ltd/Eggleton  AC 444. In this case, the contract provided an option for the acquisition of leases at a reasonable price agreed upon by two appraisers, one designated by buyers or sellers. The sellers refused to name their expert, so the contract machine collapsed.
The Court of Appeal found that this was simply an agreement that could be reached. The House of Lords disagreed. Its masters were rejected by an earlier authority which purported to prevent the courts from substituting for the valuation method agreed upon by the parties, that is, the agreement as a binding option for the purchase of leases at a fair and equitable price. This award was something that the court could decide if the contract procedure was deadlocked. In Mamidoil-Jetoil Greek Petroleum Company SA/Okta Crude Oil Refinery AD  EWCA Civ 406, the Court of Appeal reviewed the authorities and distilled a (non-exhaustive) list of principles that each court or arbitrator should direct when dealing with contractual provisions that might appear uncertain or incomplete. The first principle, which is the hallmark of contract law, is that any agreement must be established taking into account its own conditions and circumstances. Still in office. Rix L J gave the following indications (as we added): In T v T  EWHC B3 (Fam), the court heard that a separation agreement had been signed by the parties in 1991, about 22 years ago. The agreement met all the requirements of an agreement reached, but had never been submitted for Tribunal approval in the form of an approval decision. The wife did not give an explanation for the failure, while the husband stated that he expected his lawyers to consider the court`s consent. The examples cited above dealt with situations in which the parties had not indicated price or remuneration. What will happen if the treaty does not specify what a party should do in terms of performance? First, if a party has committed to a specific obligation and the contract is clearly legally binding, English law will endeavour to find substance in the undertaking, even if it is described in general.