The Governance of Britain Green Paper continues the programme of constitutional reform begun in 1997, and appears to reinforce the juridi¢cation of the UK's constitution. Nevertheless, several key reforms will be implemented not by legislation, but by creating new conventions.This article argues that such 'declared' conventions are best understood as a form of constitutional 'soft law', which attempt to in£uence constitutional behaviour rather than generating binding norms. Applying a regulatory analysis, it then argues that the case for a soft, rather than hard law approach to constitutional reform is weaker than its widespread use in the UK suggests. Finally, the article challenges the thesis that the political constitution is being replaced by a legal constitution, arguing that the government's attitude to constitutional reform still exhibits basic characteristics of political constitutionalism. Moreover, there is more to contemporary constitutional developments than a bipolar contest between political and legal constitutionalism.