Wills Act 2008

The whole or any part of a will may be revoked only – in the circumstances mentioned in Division 1 or 2 of Part 3 or by the operation of section 16 or 17; or by a later will; or by some writing declaring an intention to revoke it, executed in the manner in which a will is required to be executed by this Act; or by the testator, or some person in his or her presence and by his or her direction, burning, tearing or otherwise destroying it with the intention of the testator of revoking it; or by the testator, or some person in his or her presence and by his or her direction, writing on the will or dealing with the will in such a manner that the Court is satisfied from the state of the will that the testator intended to revoke it.

A will is not revoked by a presumption of intention on the ground of an alteration in circumstances.