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The following was the composition of the Commons at dissolution at 00:01, Wednesday 6 November 2019. All 650 seats are now vacant.
 * Notes
 * For full details of changes during the 57th Parliament, see Defections and suspensions and By-elections.
 * Labour, as the largest party not in government, took the role of Official Opposition (OO). The Co-operative Party was represented in the House of Commons by Labour MPs sitting with the Labour and Co-operative designation.
 * "Members elected" refers to the composition resulting from the election on 8 June 2017, but note that the confidence and supply arrangement (C&S) was only reached on 26 June.
 * The "voting total" is the effective size of the House excluding vacancies, suspensions, and certain members (ten at dissolution): the Speaker, two (usually three) Deputy Speakers (one Labour and one Conservative) who have only a tie-breaking vote constrained by conventions, and seven abstentionist members (Sinn Féin). This left relevant party voting totals as follows: Con 297, Lab 241, SF 0, Speaker 0.
 * The "safe majority" (the number of seats needed to have a majority of one or two), "Gov short by" (the margin by which the governing Conservatives are short of that majority), and "Gov + C&S total" are based on the voting totals. The Conservative government entered into a confidence and supply agreement with the Democratic Unionist Party (DUP) to secure a small majority, which shrank due to defections, finally disappearing on 3 September 2019. Hence, the "Gov + C&S majority", calculated as the sum of voting Conservative and DUP members, less the sum of all other voting members, ended up negative.