What is the House of Lords for?
The House of Lords is the second chamber of the UK Parliament. Its central function is revision and scrutiny — examining legislation in detail and asking the Commons to think again — rather than blocking it.
What it does:
Revising legislation. The Lords examines bills line by line, frequently in greater detail than the Commons manages, and proposes amendments. Many are technical improvements the government accepts; some are substantive challenges. Bills pass back and forth in what is informally called ping pong until both Houses agree.
Scrutiny of government, through questions and debates.
Select committee work, which is widely regarded as its strongest output — long-form inquiries on science, economics, the constitution and international affairs, drawing on members' expertise and not constrained by the electoral cycle.
What limits its power, and this is essential:
It cannot block money bills — taxation and spending are the Commons' domain.
The Parliament Acts (1911 and 1949) allow the Commons to pass legislation without Lords consent after a delay, so the Lords can delay but not veto.
The Salisbury Convention means the Lords does not oppose at second reading any measure that was in the governing party's manifesto — recognising that it lacks a democratic mandate to overrule elected commitments.
Who sits there. Around 800 members, making it one of the largest legislative chambers in the world:
Life peers, appointed and the large majority.
92 hereditary peers, a remnant of the 1999 reform that removed most, retained as a temporary compromise that has lasted decades. Legislation to remove them has been brought forward.
26 bishops of the Church of England — the Lords Spiritual — an arrangement unique among democracies apart from Iran.
The criticisms: it is unelected; appointments are made largely on the Prime Minister's recommendation, with periodic controversy over party donors; and its size continues growing.
The defence: independent expertise, freedom from electoral pressure, and a demonstrated record of improving legislation.