The United Kingdom Parliament currently has 650 Parliamentary constituencies across the constituent countries , each electing a single Member of Parliament to the House of Commons by the plurality system of election, ordinarily every five years. Voting last took place in all 650 of those constituencies at the United Kingdom general election on 8 June 2017, and these results have been counted and verified. The number of seats rose from 646 at the 2005 general election after proposals made by the boundary commissions for England, Wales and Northern Ireland were adopted through statutory instruments. Constituencies in Scotland remained unchanged, as the Boundary Commission for Scotland had completed a review just before the 2005 general election. Primary legislation provides for the independence of the boundary commissions for each of the four parts of the UK; the number of seats for each of the countries; permissible factors to use in departing from any old boundaries; and a strong duty to consult. For the 2013 review this was primarily the Parliamentary Voting System and Constituencies Act 2011. The Sainte-Laguë formula method is used to form groups of seats split between the four parts of the United Kingdom and the English Regions .The electorate figures given in the second column of the tables below are those used by the commissions during their reviews. These electorate figures date from the start of the review in each country: England, February 2000; Scotland, June 2001; Wales, December 2002; and Northern Ireland, May 2003. Of the 650 seats listed below, 533 are in England, 59 in Scotland, 40 in Wales and 18 in Northern Ireland.
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