This section applies where there falls to be determined for the purposes of this Part a question—
as to the reason, or principal reason, for which an employee was dismissed,
whether the reason or principal reason for which an employee was dismissed was a reason fulfilling the requirement of section 98(1)(b), or
whether an employer acted reasonably in treating the reason or principal reason for which an employee was dismissed as a sufficient reason for dismissing him.
In determining the question no account shall be taken of any pressure which by calling, organising, procuring or financing a strike or other industrial action, or threatening to do so, was exercised on the employer to dismiss the employee; and the question shall be determined as if no such pressure had been exercised.