4. If the woman is married or in a civil partnership on reaching pensionable age but the marriage or civil partnership comes to an end (because of the death of her spouse or civil partner or otherwise)—
(a)her transitional rate is to be recalculated applying paragraph 3(2), and
(b)Schedule 2 (up-rating) applies as if the recalculated rate had been the woman’s transitional rate on the day on which she reached pensionable age.