Since 2017 the British Labour Party has proposed mandatory sectoral collective bargaining (SCB) as a comprehensive strategy to rebuild the trade union voice across the entire economy. The intellectual roots lie in the Institute of Employment Rights’ (IER) Manifesto for Labour Law (2016). First, this article explains the core IER approach, questioning its feasibility given current low levels of union membership and bargaining coverage and whether it would produce the stable and productive economy promised. Second, the article develops four social science objections to this state‐driven approach centred on industrial relations history; political sociology; economics; and political philosophy. The conclusion argues that while stronger voluntary trade unions could help, it is neither practicable nor desirable for the state to impose a trade union, single‐channel approach to employee voice. Instead, a ‘mixed economy of voice’ is proposed, perhaps including statutory works councils, which speaks directly to all employees—union and non‐union—and wins broader political, employer and public support.