Introduction
The UK Parliament is a bicameral system, consisting of the House of Commons and the House of Lords. Both Houses contribute to law-making, scrutiny of the government, and public debate, but they differ in composition, powers, and functions. This essay compares the two Houses, using key political concepts and examples to evaluate their strengths and weaknesses.

Composition
The House of Commons is made up of 650 elected MPs, each representing a constituency. MPs are chosen through the first-past-the-post (FPTP) electoral system, which ensures clear local representation but can produce disproportionate national results. The House of Lords is largely unelected and includes life peers, hereditary peers, and bishops. Life peers are appointed by the Monarch on the advice of the Prime Minister or the House of Lords Appointments Commission, often for expertise in law, politics, business, or academia. Hereditary peers inherit their titles, though most no longer have seats following the House of Lords Act 1999.

Powers
The House of Commons is the dominant chamber in the UK’s parliamentary system and is central to parliamentary sovereignty. It can propose, amend, and pass legislation, control taxation and public spending, and hold the government to account. The Lords has a more secondary or revising role, scrutinising bills and suggesting amendments, but it cannot permanently block legislation due to the Parliament Acts 1911 and 1949, which limit the Lords to delaying non-financial bills for up to one year. Money bills, including taxation and spending, must originate in the Commons and cannot be amended by the Lords.

Functions
Both Houses participate in law-making, debates, and government scrutiny, but their focus differs. The Commons is politically active and reflects representative democracy, with MPs representing their constituents and party policies. It holds question time, participates in select committees, and debates legislation publicly. The Lords provides a deliberative function, using the expertise of its members to review legislation in detail, conduct inquiries, and advise on legal and constitutional implications. Its unelected nature allows it to operate with greater independence from party politics.

Strengths and Weaknesses
The Commons’ strength lies in its democratic legitimacy and accountability to the electorate. However, party discipline can limit MPs’ independence, reducing the effectiveness of scrutiny. The Lords’ strength is its experience and expertise, improving the quality of legislation and offering a check on the political pressures of the Commons. Its main weakness is the lack of democratic legitimacy, raising questions about accountability and fairness.

Effectiveness
The bicameral system ensures a balance between democratic legitimacy and informed scrutiny. The Commons drives government policy, reflects public opinion, and maintains government accountability, while the Lords enhances the legislative process through detailed examination and independent review. Critics argue for Lords reform to increase legitimacy, but supporters stress its complementary role in a modern democracy.

Conclusion
The House of Commons and House of Lords are complementary components of the UK’s bicameral legislature. The Commons provides democratic representation and legislative authority, while the Lords offers expertise, scrutiny, and revision. Both are essential for effective law-making and holding the government accountable, though ongoing debates about reform, especially of the Lords, highlight tensions between tradition, expertise, and democratic legitimacy in the UK Parliament.