In 1956 it argued for British participation in the European Economic Community.  It continues to exist today, arguing for federalism for the whole of Europe and the world.
Its description of federalism is that it divides political power between levels of government to achieve the best combination of democracy and effectiveness. Federalism is not the bureaucratic centralisation of popular myth.
^ abcPeter Barberis, John McHugh, Mike Tyldesley, Encyclopedia of British and Irish Political Organizations: Parties, Groups and Movements of the 20th Century, Continuum International Publishing Group, 2000, ISBN 0826458149. (p.135)
^Michael Burgess, The British Tradition of Federalism. Fairleigh Dickinson Univ Press, 1995. ISBN 0838636187 (p.142)