5.—(1) Where 2 or more earnings-related supplements to any benefits under the Act would apart from this regulation be payable for the same period, for the purposes of regulation 4(1) each such supplement shall be treated as part of the benefit it supplements.
(2) Where an earnings-related addition to widow's allowance would apart from this regulation be payable for the same period as any other benefit under the Act which is calculated whether wholly or in part by reference to the contributions of a husband who has died, that other benefit shall be adjusted by deducting from it the amount of the earnings-related addition, provided that where the widow is also entitled for the same period to graduated retirement benefit or additional component, or both of them, by virtue of her own contributions and the contributions of the husband who has died, the graduated retirement benefit or additional component to be adjusted shall be only that part which is payable by virtue of the contributions of the husband who has died.
(3) Paragraph (1) shall not apply where apart from this regulation a widow's allowance would be payable for the same period as 2 or more other benefits under the Act; in such a case the earnings-related supplement to any of those other benefits shall be adjusted so that only the higher or highest of them is payable.
(4) For the purposes of paragraph (2), additional component or graduated retirement benefit, where it is, or but for this regulation would be, payable as part of the rate of or as an increase of another personal benefit, shall be treated as part of the personal benefit with which it is so payable.