Explained in plain English
How often are byelections?
Byelections happen whenever an elected official, like a mayor or MP, leaves their post before their term ends. This could be due to resignation, death, or taking a new job, as Andy Burnham did to become Prime Minister. They're not scheduled, so their frequency varies.
Stories that explain this
Greater Manchester mayoral byelection sees Labour expected to win comfortablyQuestions this opens up
Who calls a byelection? How long is a mayoral term? What is a snap election?This explainer came from a news story
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