The Spirit of '45 is a 2013 documentary film by British director Ken Loach, focused on and celebrating the radical changes in post-war Britain under the Labour government of Clement Attlee, which came to power in 1945. Relying primarily on archive footage and interviews, and without a narrative voiceover, the film recounts the endemic poverty in prewar Britain, the sense of optimism that followed victory in World War II and the subsequent expansion of the welfare state, founding of the National Health Service and nationalisation of significant parts of the UK's economy. The film documents the extent to which these achievements, as Loach sees them, have since been subject to attack in the decades that followed, particularly under the Conservative governments of Margaret Thatcher in the 1980s. Loach said that the model for the film was "oral history, with pictures".