239 To my mind, reasoning of this kind is applicable to my findings in the present case. Initially, Mr McPhee was only concerned to ensure that what he saw was what he got. It was explained to him that a third party was thought to be entitled to the Executive portion, being a sliver of land lying outside the visible boundaries of what he saw. It was pursuant to this understanding that transfers and other documents were executed that had the effect, eventually, of vesting in Mr McPhee a registered title to the land he saw, that is to say, the residential property known as 40 Heytesbury Road, but also, as a side effect, title to the Executive portion. When, at a later stage, he decided to repudiate the understanding which had enabled him to obtain title to 40 Heytesbury road, the reasoning of the High Court in Bahr v Nicolay (supra) suggests that, if not before, a constructive trust was then constituted in favour of the plaintiff, this being a consequence of the second defendant's unconscionable conduct, and a matter sufficient to bring the case within one of the acknowledged exceptions to indefeasibility.