UK local by-elections, 2017

[Gary J]

The decisions on Tony Benn's ineligibility and that his opponent was entitled to be returned
 (despite having actually lost the election) was certified by Judges hearing an election Petition. The House of Commons was bound by statute to pass a motion to amend the return. The Speaker ruled that the motion was not amendable or debatable and it passed 235 to 145.

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[Gary J]

The Association of Liberal Democrat Councillors have a list of 34 local by-elections due to take place on 8th June (the same day as the Parliamentary general election). They may receive rather less attention than normal.

https://www.aldc.org/category/forthcoming-by-elections/