 However, in relation to the doctrine of undue influence the courts have taken a softer line than in other equitable doctrines.Before "Royal Bank of Scotland v Etridge (No 2)" the position in relation to undue influence was more orthodox - it would be necessary to establish that the third party had "constructive notice" of the circumstances that vitiated the consent of the affected person.Instead, the House of Lords said, the preferred language should be whether the third party (i.e.