Gifts to attesting witness or to wife or husband of attesting witness to be void
10.—(1)  If any person attests the execution of any will to whom or to whose wife or husband any beneficial devise, legacy, estate, interest, gift or appointment of or affecting any real or personal estate, other than and except charges and directions for the payment of any debt, shall be thereby given or made, the devise, legacy, estate, interest, gift or appointment shall, so far only as concerns the person attesting the execution of the will, or the wife or husband of that person, or any person claiming under that person or wife or husband, be utterly null and void.
(2)  The attesting witness referred to in subsection (1) shall be admitted as a witness to prove the execution of the will or to prove the validity or invalidity thereof, notwithstanding the devise, legacy, estate, interest, gift or appointment mentioned in the will.
(3)  The attestation of a will by a person to whom or to whose spouse there is given or made any disposition as is described in subsection (1) shall be disregarded for the purposes of that subsection if the will is duly executed without his attestation and without that of any other such person.
(4)  Subsection (3) shall apply to the will of any person dying after 29 May 1992, whether executed before or after 29 May 1992.