The Salisbury Convention is a long-standing agreement that the House of Lords will not vote down a bill that was mentioned in the governing party's election manifesto.
This convention is based on the principle of democratic legitimacy, acknowledging that the unelected Lords should not obstruct the mandate given to the government by the voters.
Financial Privilege prevents the Lords from making amendments to legislation that would have significant implications for public spending or taxation, as these are the sole preserve of the Commons.
| Feature | House of Commons | House of Lords |
|---|---|---|
| Membership | 650 elected MPs | ~800 appointed/hereditary peers |
| Primary Role | Government formation & finance | Revision & scrutiny |
| Legislative Power | Can override the Lords | Can only delay for one year |
| Party Influence | Strong (Party Whips) | Moderate (Many Crossbenchers) |
When analyzing the Lords' power, always distinguish between their formal legal powers (which are weak) and their political influence (which is strong).
Use the Parliament Acts of 1911 and 1949 as the primary evidence for why the House of Commons is the dominant chamber in the UK's bicameral system.
Remember that the Lords' effectiveness is often measured by the number of government defeats they inflict, which forces the executive to reconsider or refine its policies.