The Liberal Democrats, at the time of writing, have only fourteen MPs. Yet the significance of Liberalism in the history of the Constitutional History of the United Kingdom does not lie in the immediate present: this is a story that stretches deep into the past; covering not merely the giants of the historic Liberal Party in the nineteenth century, but the Whig inheritance from seventeenth- and eighteenth-century constitutional disputes. Hence, while this chapter will conclude with reference to the modern Liberal Party – an alliance, from 1981, between historic Liberalism and the Social Democratic Party; fusing formally in 1988 – it will primarily consider the longer history of Liberalism and the British Constitution.