5(1)In paragraph 2(d) above “invalidity pension day” means a day—
(a)for which the employee in question was entitled to an invalidity pension, a non-contributory invalidity pension (under section 36 of the 1975 Act) or a severe disablement allowance; or
(b)for which he was not so entitled but which was the last day of the invalidity pension qualifying period.
(2)In sub-paragraph (1)(b) above the “invalidity pension qualifying period” means the period mentioned in section 33(1) or, as the case may be, 40(3) or 41(2) above as falling within the period of interruption of employment referred to in whichever of those provisions is applicable.