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| below =
- 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
}}
This template's initial visibility currently defaults to autocollapse, meaning that if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute), it is hidden apart from its title bar; if not, it is fully visible.
To change this template's initial visibility, the |state= parameter may be used:
{{Westminster by-elections in Northern Ireland|state=collapsed}}will show the template collapsed, i.e. hidden apart from its title bar.{{Westminster by-elections in Northern Ireland|state=expanded}}will show the template expanded, i.e. fully visible.