Section 5 of the Principal Act is hereby amended by the substitution of the following subsections for subsections (1), (2) and (3):

"(1) For the purposes of this Act (other than section 2(4)), the lock-out of an employee shall be deemed to be a dismissal and the dismissal shall be deemed to be an unfair dismissal if, after the termination of the lock-out -

(a) the employee was not permitted to resume his employment on terms and conditions at least as favourable to the employee as those specified in paragraph (a) or (b) of subsection (1) of section 7 of this Act, and

(b) one or more other employees in the same employment were so permitted.

(2) The dismissal of an employee for taking part in a strike or other industrial action shall be deemed for the purposes of this Act to be an unfair dismissal if -

(a) one or more employees of the same employer who took part in the strike or other industrial action were not dismissed for so taking part, or

(b) one or more of such employees who were dismissed for so taking part were subsequently permitted to resume their employment on terms and conditions at least as favourable to the employees as those specified in the said paragraph (a) or (b) and the employee was not.