Sch A1 para 150
(1) This Part of this Schedule also applies if— (a) the parties have agreed that a union is (or unions are) recognised as entitled to conduct collective bargaining on behalf of a bargaining unit, (b) the CAC has specified to the parties under paragraph 63(2) the method by which they are to conduct collective bargaining, and (c) the parties have not agreed in writing to replace the method or that paragraph 63(3) shall not apply. (2) In such a case references in this Part of this Schedule to the bargaining arrangements are to— (a) the parties’ agreement mentioned in sub-paragraph (1)(a), and (b) anything effective as, or as if contained in, a legally enforceable contract by virtue of paragraph 63.