17. The employer shall not vary the contractual terms affecting the pay, hours or holidays of workers in the bargaining unit, unless he has first discussed his proposals with the union. Such proposals shall normally be made by the employer in the context of his consideration of the union’s claim at Steps 3 or 4. If, however, the employer has not tabled his proposals during that process and he wishes to make proposals before the next bargaining round commences, he must write to the union setting out his proposals and the reasons for making them, together with the supporting evidence. The letter shall provide information estimating the costs and staffing consequences of implementing each element of the proposals, unless the employer is not required to disclose such information for any of the reasons specified in Article 40(1) of the 1992 Order. A quorate meeting of the JNB shall be held within five working days of the Union Side’s receipt of the letter. If there is a failure to resolve the issue at that meeting, then meetings shall be arranged, and steps shall be taken, in accordance with Steps 5 and 6 of the above procedure.