17.—(1) Sections 10, 11 and 12 shall not apply in respect of proceedings arising out of or relating to a strike or other industrial action by a trade union or a group of workers in disregard of or contrary to, the outcome of a secret ballot relating to the issue or issues involved in the dispute.

(2) In the case of ballots by more than one trade union, the outcome of a secret ballot referred to in subsection (1) shall mean the outcome of the aggregated ballots.

(3) Where two or more secret ballots have been held in relation to a dispute, the ballot referred to in subsection (1) shall mean the last such ballot.