(1) A will, or a part of a will, that has been revoked is not revived unless—
(a) the testator re-executes it in the manner in which a valid will is required by part 2 to be executed; or
(b) the testator executes, in the manner in which a valid will is required by part 2 to be executed, a valid codicil that shows the intention of the testator to revive the will.
(2) If a testator who has revoked the remainder of a will after having previously revoked part of the will revives the will, the revival operates, unless the contrary intention appears, to revive only so much of the will as was last revoked.
(3) A will that is revoked and subsequently revived shall, for this Act, be deemed to have been made at the time when it is revived.