(1) If a person attests the execution of a will, and any devise, bequest, estate, interest, gift, or appointment, of or affecting any property (other than charges and directions for the payment of any debt or debts) is given or made by the will to that person or his spouse or civil partner, that devise, bequest, estate, interest, gift, or appointment shall, so far only as concerns the person attesting the execution of the will, or the spouse or civil partner of that person, or any person claiming under that person or spouse or civil partner, be utterly null and void.

(2) The person so attesting shall be admitted as a witness to prove the execution of the will, or to prove the validity or invalidity thereof, notwithstanding such devise, bequest, estate, interest, gift, or appointment.