Commissioners representing the parliaments of England and Scotland agreed to the Treaty of Union, setting the stage for the creation of a unified kingdom.

The Parliaments of England and Scotland both passed Acts of Union, formally creating the Kingdom of Great Britain and dissolving the separate English and Scottish parliaments.

The Parliaments of Great Britain and Ireland passed Acts of Union, leading to the formation of the United Kingdom of Great Britain and Ireland.

The Parliament of the United Kingdom passed the Government of Ireland Act, leading to the partition of Ireland. The southern part of Ireland became the Republic of Ireland, while Northern Ireland remained part of the UK.

The United Kingdom officially joined the European Communities (EC), marking a significant shift in its international relations and economic policy.

The House of Lords Act sought to reduce the number of hereditary peers within the Lords to remove their automatic right to sit and vote.

The policy of the British Government in England was to establish elected regional assemblies with no legislative powers. The London Assembly was the first of these, established following a referendum.

The Constitutional Reform Act outlined plans for a Supreme Court of the United Kingdom to replace the role of the Law Lords.

The Senedd gained limited law-making powers through the Government of Wales Act.

The Scottish National Party (SNP) became the largest party in the Scottish Parliament following the Scottish Parliament election, leading to Alex Salmond becoming the first First Minister from a party other than Labour.

The Supreme Court of the United Kingdom officially replaced the House of Lords as the final court of appeal for civil cases within the United Kingdom.

The 2010 general election resulted in a hung parliament, leading to the formation of a coalition government between the Conservatives and Liberal Democrats.

The Scottish National Party (SNP) won an outright majority at the Scottish Parliament election, marking a pivotal moment for Scottish nationalism and prompting resignations from opposition party leaders.

The Welsh devolution referendum enhanced the Senedd's primary law-making powers, enabling it to legislate without consulting the British parliament in devolved areas.

A referendum on Scottish independence was held, with 44.7% of voters supporting independence and 55.3% voting against it.

The Conservative Party won an outright majority of seats in the parliamentary elections, leading to the end of the Conservative–Liberal Democrat coalition government that had been in place since 2010.

The United Kingdom voted to leave the European Union in a referendum, triggering a series of political and economic changes.

The Conservative Party won the largest number of seats in the general election, but without an overall majority, leading to a minority government supported by the DUP.

The United Kingdom government invoked Article 50 of the Treaty on European Union, formally starting the process of withdrawing from the European Union.

The Brexit withdrawal agreement was passed, setting the stage for the UK's departure from the European Union.

The United Kingdom officially withdrew from the European Union, marking the end of its membership and the beginning of a transition period.

Keir Starmer was elected as the leader of the Labour Party, succeeding Jeremy Corbyn and marking a new direction for the party.

The UK ended the transition period which ended the incorporation of European Union law into UK law, and ended its membership of the EU Customs Union, and the European single market.

Sir Keir Starmer assumed the role of Prime Minister of the United Kingdom.

Starmer's Labour government introduced the House of Lords (Hereditary Peers) Bill. The bill strives to remove all individuals who hold legislative positions, resulting from birthright, to improve democratic representation within the legislative system.