An act done by a trade union to induce a person to take part, or continue to take part, in industrial action is not protected as respects his employer unless the union has taken or takes such steps as are reasonably necessary to ensure that the employer receives within the appropriate period a relevant notice covering the act.
Subsection (1) imposes a requirement in the case of an employer only if it is reasonable for the union to believe, at the latest time when steps could be taken to ensure that he receives such a notice, that he is the employer of persons who will be or have been induced to take part, or continue to take part, in the industrial action.
For the purposes of this section a relevant notice is a notice in writing which—
The lists referred to in subsection (3)(a) are—
The figures referred to in subsection (3)(a) are—
The information referred to in subsection (3)(a)(ii) is such information as will enable the employer readily to deduce—
The lists and figures supplied under this section, or the information mentioned in subsection (3C) that is so supplied, must be as accurate as is reasonably practicable in the light of the information in the possession of the union at the time when it complies with subsection (1).
For the purposes of subsection (3D) information is in the possession of the union if it is held, for union purposes—
Nothing in this section requires a union to supply an employer with the names of the affected employees.
For the purposes of subsection (1) the appropriate period is the period—
For the purposes of subsection (1) a relevant notice covers an act done by the union if the person induced falls within a notified category of employee and the workplace at which he works is a notified workplace and—
In subsection (5)—
In this section references to the "affected employees" are references to those employees of the employer who the union reasonably believes will be induced by the union, or have been so induced, to take part or continue to take part in the industrial action.
For the purposes of this section, the workplace at which an employee works is—
For the purposes of this section—
Subject to subsections (7A) and (7B), where—
no relevant notice covering acts done to induce persons to take part in the earlier action shall operate to cover acts done to induce persons to take part in the action authorised or endorsed at the later date and this section shall apply in relation to an act to induce a person to take part, or continue to take part, in the industrial action after that date as if the references in subsection (3)(b)(i) to the industrial action were to the industrial action taking place after that date.
Subsection (7) shall not apply where industrial action ceases to be authorised or endorsed in order to enable the union to comply with a court order or an undertaking given to a court.
Subsection (7) shall not apply where—
The requirement imposed on a trade union by subsection (1) shall be treated as having been complied with if the steps were taken by other relevant persons or committees whose acts were authorised or endorsed by the union and references to the belief or intention of the union in subsection (2) or, as the case may be, subsections (3), (5) , (5C) and (6) shall be construed as references to the belief or the intention of the person or committee taking the steps.
The provisions of section 20(2) to (4) apply for the purpose of determining for the purposes of subsection (1) who are relevant persons or committees and whether the trade union is to be taken to have authorised or endorsed the steps the person or committee took and for the purposes of subsections (7) to (7B) whether the trade union is to be taken to have authorised or endorsed the industrial action.