“It is essential …that a testator shall understand the nature of the act and its effects; shall understand the extent of the property of which he is disposing; shall be able to comprehend and appreciate the claims to which he ought to give effect; and, with a view to the latter object, that no disorder of the mind shall poison his affections, pervert his sense of right, or prevent the exercise of his natural faculties — that no insane delusion shall influence his will in disposing of his property and bring about a disposal of it which, if the mind had been sound, would not have been made.”
“336. The legal principles in relation to knowledge and approval are not seriously in dispute. The propounder of a will … must prove that the testator knew and approved its contents at the time of execution. That burden is normally discharged relatively easily by proof of testamentary capacity and of due execution. If both are proved, there is a presumption of knowledge and approval. On this presumption, see eg Sherrington v Sherrington[2005] EWCA Civ 326 , [69]. … However if there are suspicious circumstances around the making of the will or as to its contents, the vigilance of the court may be aroused and affirmative proof from the [propounder] may be required.”
“12.5 In my opinion, [the deceased] had a disorder of mind, namely dementia due to cerebrovascular disease. However, I think at the time she instructed and signed her will, she was in the very earliest stages of the condition and her symptoms were not severe enough to affect negatively her testamentary capacity. 12.6 There is no evidence that [the deceased] had an insane delusion. There is no evidence that she was confused around the time she instructed and executed her will.”