UK Government, the Law and Your Role
What is a "by-election" triggered by?
AA general election result being formally challenged or overturned in the courts
BThe death or resignation of an MP, requiring a new vote in that constituency ✓
CThe Prime Minister deciding to dissolve Parliament and call a snap general election
DA local council formally passing a motion of no confidence in their local MP
Explanation
A by-election is held in a constituency when the MP dies, resigns or is otherwise unable to continue. Only voters in that constituency vote in a by-election.
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