Wills Ordinance

(1)
No will or part of a will shall be revoked otherwise
than—
(a)
by marriage as provided by
section 14
;
(b)
by another valid will;
(c)
by a written revocation executed in a manner in which the testator could validly execute a will; or
(d)
by the burning, tearing or otherwise destroying of it by the testator, or by some person in his presence and by his direction, with the intention of revoking it.
(2)
No will shall be revoked by any presumption of an intention on the ground of an alteration in circumstances.