By-elections since May 2015

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10 by-elections have been held since the general election

CountryConstituencyMPMajorityWinning party 
EnglandBatley & SpenTracy Brabin16,537LabourNo change
EnglandCopelandTrudy Harrison2,147ConservativeCon gain from Lab
WalesOgmoreChristopher Elmore8,575LabourNo change
EnglandOldham West & RoytonJim McMahon10,722LabourNo change
EnglandRichmond ParkSarah Olney1,872Liberal DemocratsLib Dem gain from Con
EnglandSheffield Brightside & HillsboroughGill Furniss9,590LabourNo change
EnglandSleaford & North HykehamCaroline Johnson13,144ConservativeNo change
EnglandStoke-on-Trent CentralGareth Snell2,620LabourNo change
EnglandTootingRosena Allin-Khan6,357LabourNo change
EnglandWitneyRobert Courts5,702ConservativeNo change