Third periodic review of Westminster constituencies

The third periodic review of Westminster constituencies was undertaken in the United Kingdom between 1976 and 1983 by the four boundary commissions. The reviews took account of the major local government reorganisations that had become effective in 1974, and resulted in significant changes to the electoral map. The previous 635 seats were replaced with 650 constituencies, of which 90% were newly created or significantly revised. The new boundaries were first used for the 1983 general election.