74.—(1) An employee may present a complaint to an industrial tribunal on the ground that action has been taken against him by his employer in contravention of Article 73.
(2) An industrial tribunal shall not consider a complaint under this Article unless it is presented—
(a)before the end of the period of three months beginning with the date of the action to which the complaint relates or, where that action is part of a series of similar actions, the last of those actions, or
(b)within such further period as the tribunal considers reasonable in a case where it is satisfied that it was not reasonably practicable for the complaint to be presented before the end of that period of three months.