United Workers ('UW') is a recently registered trade union with members in Gold Miners (Pty) Ltd ('GM'). UW approaches you as a collective labour law student to give the union advice on a number of matters. Advise UW on the following: the meaning of collective bargaining; the essence of a refusal to bargain by GM; and whether UW and its members can be bound by a collective agreement concluded between another trade union and GM for the workplace.