Retirement pension
5. Retirement pension shall be payable on Mondays, except that–
(a)where a person became entitled to a retirement pension before 28th September 1984, that pension shall be payable on Thursdays;
(b)where a woman was entitled to a widow’s benefit immediately before becoming entitled to a retirement pension, that pension shall be payable on Tuesdays;
(c)where a woman becomes entitled to a retirement pension immediately following the payment to her husband of an increase of retirement pension in respect of her, the retirement pension to which she becomes entitled shall be payable on the same days as those upon which the retirement pension of her husband is payable;
(d)the Secretary of State may, notwithstanding anything contained in the foregoing provisions of this paragraph, arrange for retirement pension to be payable on such other day of the week as he may in any particular case determine;
(e)where, in relation to any person, any particular day of the week has become the appropriate day of the week for the payment of retirement pension, that day shall thereafter remain the appropriate day in his case for such payment.