4.—(1) This paragraph applies where—
(a)the person either—
(i)was a contributory employee immediately before 16th May 1974 and became a pensionable employee on that day, or
(ii)became a pensionable employee within 12 months after having ceased to be a contributory employee, and
(b)the length of his relevant reckonable service is not less than 10 years, and
(c)notice that this paragraph is to apply is given in accordance with sub-paragraph (3) or (4).
(2) Where this paragraph applies, paragraphs 2 and 3 do not apply and the additional period is the shorter of—
(a)the period by which the person’s reckonable service would have been increased if he had continued in the employment which he has ceased to hold until he attained the age of 65 years, and
(b)the period by which his reckonable service falls short of 20 years.
(3) Subject to sub-paragraph (4), notice that this paragraph is to apply must be given by the person to the appropriate administering authority, in writing, within one month after ceasing to hold his employment or such longer period as the authority may allow.
(4) If the person dies within the period allowed for giving notice without having given it, notice may be given—
(a)if the person was a man and has left a widow, by her, or
(b)if the person was a man and has not left a widow, or his widow has died without giving notice, by his executors, or
(c)if the person was a woman, by her executors,
within 6 months after the date of the person’s death, or such longer period as the authority may allow.