Constructive knowledge (ought to have known of the special disadvantage) may suffice for unconscionable dealing claims, but constructive notice (being on notice of facts that might lead to discovery of the disadvantage) is insufficient; and the Western Australian line of authority requiring actual knowledge may be in error.
The full text is available to signed-in members, including the 29 later cases that cite this judgment.
6 of the 29 citing cases carry a classified treatment. How each court treated it is available to signed-in members.