The Labour Party has been, since its founding in the early 20th century, the principal political party of the left in the United Kingdom.

Hugh Todd Naylor Gaitskell (April 9, 1906 – January 18, 1963) was a British politician, leader of the Labour Party from 1955 until his death in 1963.

The Fabian Society is a British socialist intellectual movement, whose purpose is to advance the socialist cause by gradualist and reformist, rather than revolutionary, means

The Future of Socialism by Anthony Crosland, published in 1956, is regarded as by some distance the most influential book in post-war British Labour Party thinking. It was the seminal work of the 'revisionist' school of Labour politics.