Currently the largest trade union in the United Kingdom is called Unite. It has been formed by the merger of some of the largest unions in the country including the Transport and General Workers Union, Amicus, United Steelworkers, and the Amalgamated Engineering and Electrical Union (AEEU).

The Transport and General Workers Union (T&G) was the largest union in the United Kingdom and in 1977 it was the first union to have over two million members.

Amicus was the union which was formed in 2001 with the merger of Manufacturing Science and Finance, the Amalgamated Engineering and Electrical Union (AEEU) and two smaller unions-a finance sector workers union, and the Graphical, Paper and Media Union (GPMU).

GMB is a general trade union in the United Kingdom, and has more than 617,000 members. Its members are drawn from many sectors, with particular strength amongst manual workers in local government including schools, health care and the ambulance service, security, retail, distribution and the utilities.

UNISON is the second largest trade union in the United Kingdom with over 1.3 million members. The union was formed in 1993 when three public sector trade unions, the National and Local Government Officers Association (NALGO), the National Union of Public Employees (NUPE) and the Confederation of Health Service Employees (COHSE) merged.

THE BIGGEST UNIONS : T&G 1980: 2m

2000: 0.7m *GMB 1980: 0.9m

2000: 0.7m *UNISON 1980: 1.6m

2000: 1.3m