Question

What is a by-election, and what is a recall petition?

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A by-election fills a single vacant parliamentary seat between general elections; a recall petition is the mechanism by which constituents can trigger one where their MP has met specified conditions.

When a by-election occurs: the death of an MP; resignation; disqualification; expulsion by the House; or a successful recall petition.

How MPs actually resign, which is a genuine constitutional curiosity. MPs cannot simply resign — a rule dating from a time when membership was a duty. The workaround is to apply for an office of profit under the Crown, which disqualifies the holder from membership. Two nominal offices are maintained for this purpose: the Crown Steward and Bailiff of the Chiltern Hundreds and of the Manor of Northstead. They carry no duties and no pay, and applying for one is the accepted means of resignation.

Recall petitions. Under the Recall of MPs Act 2015, a petition opens where an MP:

Is convicted of an offence and receives a custodial sentence — including a suspended one — below the threshold that would automatically disqualify them.

Is suspended from the House following a report from the Committee on Standards, for a specified period.

Is convicted of providing false or misleading expenses claims.

How it works. The petition is open for six weeks, at signing places in the constituency and by post. If at least 10% of eligible registered electors sign, the seat is vacated and a by-election is held.

The MP may stand again in the resulting by-election, and some have done so successfully.

The features that matter: it is a petition, not a vote — there is no way to register opposition, only to sign or not, which some regard as a design flaw; signing is not secret in the way voting is, though the identities of signatories are not published; and the trigger conditions are narrow, so an MP cannot be recalled simply for being unpopular or for changing party.

Crossing the floor does not trigger a recall, and there is no mechanism requiring a defecting MP to seek re-election — a recurring source of public objection.

By-elections have unusually high swings, since they are treated as protest opportunities with no government at stake.

General information about UK parliamentary procedure.

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