(1) Subject to this Act, a person who had reckonable earnings in the relevant income tax year shall be entitled to pay-related benefit in respect of any day which -
(a) is a day of unemployment which forms part of a period of interruption of employment and in respect of which the person is entitled to unemployment benefit and which is not earlier than the 19th day of unemployment in the period of interruption of employment, or
(b) is a day of incapacity for work which forms part of a period of interruption of employment in respect of incapacity for work which commenced before the 6th day of April, 1992, in respect of which the person is in receipt of disability benefit (or would be in receipt of disability benefit but for the fact that injury benefit is payable to the person).
(2) Notwithstanding subsection (1), a person engaged in -
(b) employment in a period of interruption of employment, in which for the time being, a number of days is systematical