[65] Contrary to the appellant's submission, the probabilities of the case are not at all against the ultimate result. The evidence shows a plausible explanation as to why Mr Sinclair, whilst intending to exercise the option on 28 May, would not have delivered the required notice whilst at the respondent's Gold Coast office on that day. The reason is that Mr Sinclair had been clearly advised that the notice was not to be delivered at that place, but was to be sent to another address in Brisbane. In the appellant's case, evidence was given by Mr Chapman, who was a professional consultant to the appellant in relation to this lease and its sub-tenancies. In April 2003, Mr Chapman advised Mr Sinclair that to exercise the option, the appellant needed to do two things. The first was to bring its account up to date with its landlord, the respondent. The second was to give a notice specifically according to cl 18.2(b) of the lease, the terms of which Mr Chapman recalled discussing with Mr Sinclair. By cl 18.2, the tenant could give a notice to the landlord by delivering, posting or faxing it "to the landlord's address in the Particulars or any other address notified by the landlord to the tenant". The address in the Particulars is not where Mr Sinclair said he left the notice, but is a Brisbane address. When Mr Sinclair called upon Mr Purchase at the respondent's Gold Coast office, obtained confirmation from him of the amount outstanding and gave Mr Purchase a cheque for that sum, he was acting in accordance with Mr Chapman's advice. But had he left the notice at that address, he would have been acting inconsistently with the advice. At this point he had until the end of that week in which to give the notice as he had been advised. There is a real likelihood that he then neglected to do so, and this is no less likely than Mr Sinclair's version that he left the notice with Mrs Doody, saying nothing about it to Mrs Doody or to Mr Purchase during his discussion with him and without asking for some acknowledgment of receipt of the notice. The inherent likelihood of Mr Sinclair's having delivered the notice to the Gold Coast address has to be understood in the context of his having been advised that it was required to be sent elsewhere.