In some guarantees, the consideration is "complete." For example, the guarantee, in return for the award of a lease, is held responsible for the performance of the lease agreements. In other cases, it is "fragmentary" or delivered from time to time if a guarantee is given to insure the balance of a current account in a bank for the goods delivered If the consideration is "complete", the guarantee runs over the term of the lease and is irrevocable. If the consideration is "fragmentary" unless the guarantee is provided otherwise, the right to the guarantee may at any time terminate its liability under the guarantee. In England, the legal conditions of a guarantee are first prescribed by the fraud regulation, which provides, in Section 4, "that no action be taken to compensate the defendant for a particular undertaking of guilt, delay or miscarriage of another person, unless the agreement on which such an action is brought or a brief or mention is signed, in writing and by the party charged to him, or by any other person legally authorized by him." This means that the guarantee is not invalid, but can only be implemented by a chosen person. The written signature condition was specified in Elpis Maritimes Co v Marti Chartering Co Inc (1992) 1 AC 21 and J Pereia Fernandes SA/Mehta  EWHC 813 (Ch). In the latter case, it was found that a contract is enforceable either by a written agreement signed by the guarantor or his representative or by his representative, if the guarantee was oral, a separate note or memorandum of understanding could make the guarantee enforceable in the same way. In the first case, the court found that it was sufficient for it to be written or printed by the guarantor, that an initial in an e-mail was sufficient, but that a default header in an e-mail was not sufficient. The Tribunal found that the minor remedy was sufficient for the status to be initiated, as it had long been considered that a single fingerprint or "X" was sufficient. The Electronic Communications Act 2000 created the power to put in place legislative instruments to amend legislation to comply with the modern use of electronic communications.