The emergence and growth of the gay and lesbian movement in the United States during the post-war period is not an isolated phenomenon. Similar movements developed throughout the world, most notably in the democracies of western Europe and Canada. This chapter seeks to ascertain to what degree the British and American gay and lesbian movements resembled each other. As mentioned in the introduction, the British movement was selected for comparison because of the political institutional environment in which it evolved. That environment is discussed further in chapter 4. This chapter focuses on the movement history itself. What type of changing opportunity existed in the United Kingdom during the immediate post-war period? Did a British homophile movement exist? Did gay liberation take hold in Britain? What effect did AIDS have on the movement? Starting with the political opportunity provided by the Second World War, this chapter will trace the development of the British homophile movement, evaluate the law reform of 1967, assess the impact and effect of gay liberation, consider the influence of AIDS, and arrive at sundry conclusions regarding the movement's present status.