Welsh Parliament in the context of "Parliament of the United Kingdom"

In the United Kingdom, devolved matters are the areas of public policy where the Parliament of the United Kingdom has devolved its legislative power to the national legislatures of Scotland, Wales and Northern Ireland, while reserved matters and excepted matters are the areas where the UK Parliament retains exclusive power to legislate.

Devolution in the United Kingdom is regarded as the decentralisation of power from the UK Government, with powers devolved to the Scottish Parliament and Scottish Government, the Northern Ireland Assembly and Northern Ireland Executive and the Welsh Parliament and Welsh Government, in all areas except those which are reserved or excepted. Amongst the four countries of the United Kingdom, Scotland has the most extensive devolved powers controlled by the Scottish Parliament, with the Scottish Government being described as the "most powerful devolved government in the world".

The Parliament of the United Kingdom of Great Britain and Northern Ireland is the supreme legislative body of the United Kingdom, and may also legislate for the Crown Dependencies and the British Overseas Territories. Since 1999, varying degrees of powers have been devolved to the national parliaments of Northern Ireland, Scotland, and Wales. Each devolved parliament has different devolved powers, with Scotland being the most powerful amongst the three devolved parliaments. The central UK Parliament retains the power to legislate in reserved matters, including broadcasting, defence, and currency.

It meets at the Palace of Westminster in London. Parliament possesses legislative supremacy and thereby holds ultimate power over all other political bodies in the United Kingdom and the Overseas Territories. While Parliament is bicameral, it has three parts: the sovereign, the House of Lords, and the House of Commons. The three parts acting together to legislate may be described as the King-in-Parliament. The Crown normally acts on the advice of the Prime Minister, while the House of Lords’ powers are generally limited to delaying legislation.