Land and Business (Sale and Conveyancing) Act 1994

If a person is induced—

to enter into a contract to purchase subdivided land;

or

to affirm a contract to purchase subdivided land that is voidable by that person, by unreasonable or undue persuasion on the part of the vendor, or a person appearing to act on behalf of the vendor, then, according to the nature of the case—

the contract will be taken to have been induced by undue influence and will be voidable at the option of the person induced to enter it;

or

the affirmation will be void and of no effect.