Sch A1 para 36
(1) An application under paragraph 11 or 12 is not admissible unless the CAC decides that— (a) members of the union (or unions) constitute at least 10 per cent of the workers constituting the relevant bargaining unit, and (b) a majority of the workers constituting the relevant bargaining unit would be likely to favour recognition of the union (or unions) as entitled to conduct collective bargaining on behalf of the bargaining unit. (2) The relevant bargaining unit is— (a) the proposed bargaining unit, where the application is under paragraph 11(2) or 12(2); (b) the agreed bargaining unit, where the application is under paragraph 12(4). (3) The CAC must give reasons for the decision.