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DefinitionTestable
A by-election is held when an MP seat becomes vacant between general elections
Related questions (1)
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When is a by-election held?
Every two years between general elections
When a seat becomes vacant because an MP dies, resigns, or is disqualified
When the Prime Minister requests one
When a new political party is formed
Explanation
A by-election fills a vacancy in the House of Commons between general elections, typically caused by an MP's death, resignation, or disqualification. It is not held on a regular schedule.