2.—(1) Subject to sub-paragraph (2) and paragraphs 3 and 4, the additional period is the period specified in column (2) of the Table below appropriate to the length of the person's relevant reckonable service.
TABLE
(2) The additional period is not to exceed 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—
(a)until he attained the age of 65 years, or
(b)until his reckonable service amounted to 40 years,
whichever would have occurred first.