Any terms of a collective agreement which prohibit or restrict the right of workers to engage in a strike or other industrial action, or have the effect of prohibiting or restricting that right, shall not form part of any contract between a worker and the person for whom he works unless the following conditions are met.
The conditions are that the collective agreement—
is in writing,
contains a provision expressly stating that those terms shall or may be incorporated in such a contract,
is reasonably accessible at his place of work to the worker to whom it applies and is available for him to consult during working hours, and
is one where each trade union which is a party to the agreement is an independent trade union;
and that the contract with the worker expressly or impliedly incorporates those terms in the contract.
The above provisions have effect notwithstanding anything in section 179 and notwithstanding any provision to the contrary in any agreement (including a collective agreement or a contract with any worker).