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 * Lists of UK by-elections
 * 1801–1806
 * 1806–1818
 * 1818–1832
 * 1832–1847
 * 1847–1857
 * 1857–1868
 * 1868–1885
 * 1885–1900
 * 1900–1918
 * 1918–1931
 * 1931–1950
 * 1950–1979
 * 1979–2010
 * 2010–present
 * Northern Ireland
 * Hereditary peers