House of Lords data dashboard: Current membership of the House
This page provides interactive data on the current membership of the House of Lords.
Latest research on the House of Lords
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Lengths of prorogation since 1900
Prorogation is the mechanism by which parliamentary sessions are ended. This House of Lords Library briefing sets out the start and end dates of each parliamentary session since 1900, together with the number of calendar days between the end of the previous session and the start of the new one.
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Sovereign’s Speech: Lords movers and seconders, 1979–2026
This House of Lords Library briefing provides a list of movers and seconders of the humble address to the sovereign, following the sovereign’s speech at the State Opening of Parliament. The list provides information from 1979 to 2026.
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Hereditary by-elections results: 2002 to 2024
Between 2002 and 2024, by-elections were held to replace excepted hereditary peers who left the House of Lords. In July 2024, the House agreed to pause by-elections following the introduction of the House of Lords (Hereditary Peers) Bill. This bill was passed in 2026, ending the need for by-elections. This briefing provides a list of by-election results, including information on turnout and the number of candidates.
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House of Lords reform: Hereditary members at the end of the 2024–26 session
The right for hereditary peers to sit in the House of Lords has come to an end. This briefing lists the last hereditary peers sitting in the House of Lords when the House of Lords (Hereditary Peers) Act passed into law in March 2026, together with their length of service as a hereditary member. It also notes returns to the House as life peers.
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House of Lords data dashboard: Peerage creations
This page provides interactive data on the creation of life peerages in the House of Lords.
Hereditary peers in the House of Lords
Browse research and statistics on hereditary peers, and read about the passage of the House of Lords (Hereditary Peers) Act 2026.
Research on House of Lords reform
Browse selected research on House of Lords reform.
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Hereditary by-elections results: 2002 to 2024
Between 2002 and 2024, by-elections were held to replace excepted hereditary peers who left the House of Lords. In July 2024, the House agreed to pause by-elections following the introduction of the House of Lords (Hereditary Peers) Bill. This bill was passed in 2026, ending the need for by-elections. This briefing provides a list of by-election results, including information on turnout and the number of candidates.
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House of Lords data dashboard: Peerage creations
This page provides interactive data on the creation of life peerages in the House of Lords.
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History of the House of Lords: A Short Introduction
This House of Lords Library briefing provides a short introduction to the history of the House of Lords.
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House of Lords data dashboard: Current membership of the House
This page provides interactive data on the current membership of the House of Lords.
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Life Peerages Act 1958: 65th anniversary
This House of Lords Library Briefing has been produced to mark the 65th anniversary of the passing of the Life Peerages Act on 30 April 1958.
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House of Lords data dashboard: Party and group strengths and voting
This dashboard presents interactive data on the relative sizes of the largest political parties and groups in the House of Lords. It also presents select statistics on voting behaviour in the House.
Reading list on the House of Lords
Browse our list of books and e-books on the House of Lords. Requires a parliamentary login.