(1) Where a person -
(a) has qualifying contributions in respect of less than 260 contribution weeks in the period between his entry into insurance and any day of incapacity for work, and
(b) before that day has been entitled, in respect of any period of interruption of employment (whether including that day or not) during the period beginning on the date 1 year immediately prior to that day, to disability benefit for 312 days, he shall not be entitled to disability benefit for that day unless since the last of the said 312 days and before that day he has requalified for benefit.
(2) In the case of any claim for disability benefit which was made before the 5th day of April, 1993 subsection (1)(b) shall be construed as if "3 years" were substituted for "1 year".
(3) Notwithstanding subsection (1), where in any period a person has exhausted his entitlement to disability benefit he shall not requalify therefor unless he satisfies the conditions set out in subsection (4).
(4) Where a