"(h) A major, indeed decisive, issue in this whole matter is whether, on15 February 1993 , when the above letter [ the letter of dismissal ] was written, the industrial action was still taking place or not. ..."
"(1) At any time between the making of an order under section 163 and the determination or settlement of the complaint, the employer or the employee may apply to an industrial tribunal for the revocation or variation of the order on the ground of a relevant change of circumstances since the making of the order."