Undue Influence in UK Law

The burden of proving an allegation of undue influence rests upon the person who claims to have been wronged. The evidence required to discharge the burden of proof depends on the nature of the alleged undue influence, the personality of the parties, their relationship, the extent to which the transaction cannot readily be accounted for by the ordinary motives of ordinary persons in that relationship, and all the circumstances of the case.

Proof that the complainant placed trust and confidence in the other party in relation to the management of the complainant's financial affairs, coupled with a transaction which calls for explanation, will normally be sufficient, failing satisfactory evidence to the contrary, to discharge the burden of proof. In other words, proof of these two facts is prima facie evidence that the defendant abused the influence he acquired in the parties' relationship.

This evidential presumption shifts the onus to the dominant party and requires the dominant party, if he is to avoid a finding of undue influence, to adduce some sufficient additional evidence to rebut the presumption.

In particular, if the party asserting that he takes free of the earlier rights of another knows of certain facts which put him on inquiry as to the possible existence of the rights of that other and he fails to make such inquiry or take such other steps as are reasonable to verify whether such earlier right does or does not exist, he will have constructive notice of the earlier right and take subject to it.

What notice will be requisite will depend upon the nature of the undue influence alleged. Thus, in a Class 1 case (actual undue influence), the creditor must have notice of the circumstances alleged to constitute the actual exercise of the undue influence; In a Class 2 case it must have notice of the circumstances from which the presumption of undue influence is alleged to arise.

The abuse of confidence principle is founded on considerations of general public policy viz. that in order to protect those to whom fiduciaries owe duties as a class from exploitation by fiduciaries as a class, the law imposes a heavy duty on fiduciaries to show the righteousness of the transactions they enter into with those to whom they owe such duties.