 This last occurs when a party fails to disclose a material fact in circumstances where there is a legal duty to do so.In the past, the law recognised such a duty to speak in only a limited number of exceptional cases—where, for example, there is a special relationship of trust and confidence between the parties, as in the case of partners, or where a statute obliges a person to disclose certain information.Today, however, a general principle is emerging that requires a party to speak when the information in question is within his exclusive knowledge, and is of such a nature that the other party's right to have the information communicated would be mutually recognised by honest persons in the circumstances.