The evidence - and, as the learned trial judge observed, there was little dispute about the facts - was to the following effect. The land in question, an area of about forty-eight acres in the neighbourhood of Perth, was owned by the appellants who are husband and wife. They lived on the property on which they conducted a stud farm for breeding trotting horses. On 23 June 1962, they gave to Hillview Investments Pty Ltd, a company closely associated with the respondent, an option to purchase the land for £40,000. The land was suitable for subdivision and the appellants had obtained from the appropriate authorities approval of a proposed subdivision. The option was for a period of twelve months and £100 was paid as the consideration for its grant. In fact it was not exercised but the respondent, which was interested in purchasing the land for resale in subdivision, knew that it had been given. Towards the end of June 1963 a representative of the respondent, named Loughridge, interviewed the male appellant, Pianta, and told him that the respondent was interested in buying the land. There was some discussion about the price and terms of payment and Pianta indicated that he would be prepared to sell for £40,000. Loughridge said that he would see the respondent's manager and arrange for a contract to be prepared for the Piantas to sign. Shortly afterwards a draft contract of sale was prepared by the respondent and handed to Pianta. It provided (inter alia) for a price of £40,000 to be paid by a deposit of £1,000 upon the execution of the contract and a further payment of £14,000 in the following December. The balance (£25,000) was to be paid in December 1965 with a provision under which the respondent might reduce or pay off the whole of the balance before that date. It provided also that, on payment of the £14,000, the appellants would transfer the land to the respondent and that the respondent would thereupon execute in favour of the appellants a first mortgage to secure the payment of the balance of the purchase money. It contained a complicated provision under which the appellants undertook, if and when that balance was reduced from time to time, to execute partial discharges of the mortgage, the purpose being no doubt to enable the respondent as it sold one or more of the blocks into which the land was to be subdivided to pay off so much of the balance of the price as related to the block or blocks so sold and be in a position to give a clear title to the purchaser from it. It provided further that the appellants might continue to occupy the house on the land for a period which, in the draft contract, was left blank. A few days later Loughridge again saw Pianta who expressed general agreement with the proposed sale but said that he did not understand the meaning of some of the clauses in the document. On the following day Loughridge with a Mr. O'Sullivan, a director of the respondent, again saw Pianta. There was a further discussion in the course of which Pianta said that he would like to see his solicitor and obtain his advice. Accordingly on 18 July the appellants saw Mr. Ackland at his office in Perth. They had already posted the draft contract to him and he had examined it. He told them that he thought that some of its provisions were open to objection and advised them not to sign it in its then form. They told him that they wanted him "to protect" them and he said that he would get into touch with the respondent. On the following day he saw O'Sullivan and another representative of the respondent and discussed with them various terms of the draft contract. He told them, amongst other things, that the appellants wanted to remain in occupation of the house on the land until December 1964 and a question was raised as to whether, if this was done, the appellants should not pay rent during the term of their occupation, the respondent's representatives suggesting that a rental of £5 10s. a week would be a reasonable amount. They discussed also the provision relating to the progressive freeing of the land from the mortgage as and when instalments of the purchase price were paid. On 22 July, Ackland wrote to Pianta telling him of the proposal that a rent of £5 10s. a week should be paid during the period of occupation of the house and saying that he, Ackland, thought this was reasonable. He said also that he thought it likely that the respondent would agree that the amount of £100 which had been paid for the option which had expired should be treated as part of the purchase price and that in return the Piantas should occupy the house rent free for nineteen weeks from the date of the contract and thereafter pay a weekly rental of £5 10s. On the following day Pianta telephoned Ackland and agreed with these proposals. Ackland thereupon telephoned O'Sullivan and put these suggestions to him. O'Sullivan agreed to them and asked Ackland to prepare and submit to him a draft contract. Ackland did this and on 25 July sent the draft to the respondent. Throughout this period the Piantas were pressing for the completion of the transaction by the end of July. The stud season was to begin on 1 August, bookings had been made for mares to be brought to the stud farm and, if the sale was completed, other land would have to be found to which to move the stud. This was known to the respondent and to Ackland. On 26 July, O'Sullivan and another representative of the respondent met Ackland again and together they went through the draft contract which the latter had prepared. Some amendments were suggested by O'Sullivan and Ackland was asked by him to prepare a contract for execution by the parties. He did this and, on 30 July, sent a letter to the respondent enclosing two engrossed copies of "the agreement for sale for execution" by it. In his letter he pointed out that the documents differed in a number of specified respects from the draft that had been submitted on 25 July and went on to say: "The alterations which we have made are, we believe, as discussed with Mr. McCusker and Mr. O'Sullivan. If the agreement appears to express the intention of the purchaser would you be good enough to have it executed and return both copies to us for excecution by our clients at your earliest convenience." He enclosed also a memorandum of "our costs and estimated stamp duty". On 1 August, Pianta telephoned Ackland and asked whether the contracts had been returned by the respondent and was told that they had not. Later that day he called at Ackland's office and repeated his question and asked whether the deposit had been paid. Ackland said that the documents had not been returned and that the deposit had not been paid and Pianta thereupon stated that he had sold the land to someone else. Ackland immediately telephoned to O'Sullivan and told him what Pianta had said. Later in the afternoon, Ackland received from the respondent a letter enclosing the contracts executed by the respondent together with a cheque for the costs and estimated amount of stamp duty. The letter stated that the respondent would pay the "balance of deposit upon receipt of our copy of the executed agreement". The reference to the "balance of deposit" is explained by the fact that the contract acknowledged that of the deposit of £1,000, £100, representing the payment for the option, had already been received by the appellants. Ackland immediately wrote to the respondent returning the cheque and confirming that Pianta had informed him that he had sold the land to another purchaser. On the following day the solicitors for the respondent wrote to Ackland enclosing a cheque for £900, being the balance of the deposit. Ackland returned the cheque.