A will or part of a will may be revoked only—
(a) under section 14 , 14A , 15 , 15A or 15B ; or
(b) by a will or other instrument made under an order under section 19 or 21 ; or
(c) by a later will; or
(d) by a document that—(i) declares an intention to revoke the will or part; and(ii) is executed in the way in which a will is required to be executed under this part; or
(e) by the testator, or someone in the testator’s presence and at the testator’s direction—(i) burning, tearing or otherwise destroying the will with the intention of the testator to revoke it; or(ii) writing on the will, or dealing with the will, in a way that satisfies the court, from the state of the will, that the testator intended to revoke it.