Use a properly executed document
A later will can expressly revoke an earlier will. Section 37 also addresses inconsistent later provisions and destruction by or at the direction of the testator with the intention to revoke. Because intention and execution both matter, informal handwritten changes should not be treated as a safe solution.
Alterations have formal consequences
Section 35 addresses erasures, interlineations and other alterations made after execution. Unless the statutory execution requirements are met, an alteration may have no effect except where the original wording is no longer apparent. Keep the original intact and obtain advice on a new will or codicil.
Revival is not automatic
Under section 39, a revoked will or revoked part is not revived merely because a later document is destroyed. Revival requires re-execution in the prescribed manner and an intention to revive. A complete review avoids accidentally leaving an earlier plan ineffective.
Review connected documents
A new will should be checked against foreign wills, beneficiary nominations, company arrangements and jointly held property. Tell the adviser about every earlier testamentary document so revocation wording does not unintentionally affect assets in another country.