The foundations of any liberal democracy lie with its constitutional arrangements, the key means by which the powers of the state are specified, distributed across different institutions and regulated. Constitutions set out how the state is structured, what its major institutions are, and what basic principles govern their relations with each other and with citizens. In the UK these provisions are famously diverse and uncodified, with no single written ‘constitution’ document. Michael Gordon looks at how to assess the democratic basis of constitutional law, and how well recent experience suggests that the UK has been performing.