In my opinion, it is to be implied from the agreement that should the ... property not be sold within a reasonable time, then the fate of the contract will be resolved according to the action which may be taken by either party. The purchasers may elect to waive the condition, it being one wholly for their benefit, and proceed to completion, thereby holding the vendor to its contract. Alternatively, provided that they have acted reasonably in their attempts to sell the property, they may rely on the non-fulfilment of the condition to bring the contract to an end, and recover their deposit. On the other hand, the vendor may force the issue simply by serving a notice to complete. I do not think it appropriate to contemplate a notice to the purchasers requiring them to fulfil the condition, because the time agreed for that will have expired, and in any event it does not lie within the capacity of the purchasers to fulfil it. The effect of a notice to complete is to give the purchasers, should they wish to waive the condition, the opportunity to finalize the transaction; alternatively, it serves to crystallise in the minds of both parties a common date on which the contract will come to an end for non-fulfilment of the condition. In the latter case, non-compliance with the notice to complete will not fix the purchasers with any default such as would deprive them of the right to the return of their deposit, although as I have said, a failure to make reasonable efforts to sell the property may expose them to an action for damages." [7] (my emphasis).