(1) Section 29 of the Principal Act is hereby amended by the substitution for subsection (1) (as amended by section 50 of the Act of 1991 and in this section referred to as the "
existing subsection") of the following subsections:
"(1) Subject to this Act, a person shall be entitled to unemployment benefit in respect of any day of unemployment (in this Part referred to as a 'day of unemployment') which forms part of a period of interruption of employment, if -
(a) he is under pensionable age on the day for which the benefit is claimed, and
(b) he proves unemployment in the prescribed manner, and
(c) he satisfies the contribution conditions in section 30, and
(d) he has sustained a substantial loss of employment in any period of 6 consecutive days.
(1A) The circumstances in which a person is to be regarded, for the purposes of this Chapter, as having sustained a substantial loss of employment shall be specified in regulations, and different circumstances may be specified for diffe