Before the dawn of the millennium new legislative and executive authorities will have been established in Edinburgh, Cardiff and (subject to further political and other progress) in Belfast. This article analyses the nature of these constitutional initiatives, and examines their place in the unitary state which is the United Kingdom. It begins by tracing the history of constitutional union between England, Wales, Scotland, and Ireland. The legal effect of the 1998 devolution statutes is examined, in particular on the legal sovereignty of the United Kingdom Parliament. A triple constitutional and legal lock exists in the Scotland Act 1998 to ensure that the devolution settlement is the final step away from the pure unitary state which has enfolded Scotland in Great Britain. The nature and likely success of that lock are analysed in some detail. The lawmaking powers of the Scottish Parliament, the Welsh Assembly, and the Northern Ireland Assembly are assessed. The similarities and differences between each of the three devolved governments and the British Government are highlighted, and consequences and possible lessons for future government-making at Westminster are drawn. The article concludes with a peer into the possible constitutional futures for the United Kingdom.