Undue Influence

Undue Influence is a ground for invalidating a Contract. It makes the contract voidable

Grounds
Unlike Facilty and Circumvention, there must be an existing relationship for Undue Influence for this ground to apply. This can include a lawyer and mother (Gray v Binny 1879 had a lawyer persuade a person to transfer an asset to their mother; Honeymans Executors v Sharp 1978 was a valuer who examined pictures for Honeyman, and was found to use undue influence on him in his ill state).

The relationship must also be used to manipulate the person seeking to invalidate the contract; however there is no requirement for any deceit to take place.

Abuse of good faith
Typically undue influence is presumed not to apply in the case of a husband and wife, however, where one partner pressures the other to enter into some types of contract, like financial contracts without being fully informed of the implications by the other contracting party, this can be set aside.