Although there is much criticism of the terms used (see, e.g., Jane Swanton, Discharge of Contracts for Breach, Melbourne University Law Review, vol. 13 (1981), p. 69) and suggestions that the terms may give expression to distinctions lacking any real difference (see, e.g., Kirby P. in J. & C. Reid Pty. Ltd. v. Abau Holdings Pty. Ltd. [75] ) the generally accepted formulation of the relevant law is that a party to a contract may elect to bring the obligations arising under that contract to an end in the event of repudiation, fundamental breach or breach of an essential term by the other party to the contract: see Shevill v. Builders Licensing Board [76] ; Stern v. McArthur [1] ; J. W. Carter, Breach of Contract (1984), pp. 60-61. For reasons founded in equitable principle, failure to perform an obligation which is otherwise fundamental or essential on a stipulated date or, if no date be stipulated, within a reasonable time does not entitle the other party to bring the contractual obligations to an end unless the time of performance is expressly or impliedly made essential by the contract or is made essential by an effective notice to complete: Carr v. J. A. Berriman Pty. Ltd. [2] ; Louinder v. Leis [3] ; Stern v. McArthur [4] . Given the difficulty inherent in the idea that a notice to complete can add to or alter the effect of a contractual stipulation, there is much to be said for the view that failure to comply with a notice to complete (whether that failure is on the part of the giver or the recipient) is properly to be seen as evidence of unwillingness or inability to perform the contract and hence as amounting to repudiatory conduct: see Louinder v. Leis [5] , per Mason J.; per Brennan J. [6] . See also Stern v. McArthur [7] , per Brennan J. If that be so, requirements as to form and time for an effective notice to complete are no more than those which are necessary in the particular circumstances of the case to constitute non-compliance with the notice evidence of unwillingness or inability to perform the contract, a view which seems to be implicit in Balog. Because I have formed the view that the lessor's delay coupled with failure to make adequate response to the letter of 21 August constitute repudiation entitling the lessee to terminate the obligations under the agreement, it is unnecessary to decide whether that letter constitutes an effective notice to complete. However, I should say that, in my view, neither the failure to effect registration of the lease nor the failure to tender a registrable lease within the time limited by that letter could be characterized as repudiatory conduct. Put in other words, the time limited by the letter was not sufficient to constitute failure to register the lease or failure to tender a registrable lease within that time evidence of unwillingness or inability to perform the contract.