A new bill currently before parliament alters the rules governing the periodic redrawing of the UK’s parliamentary constituencies, most notably by replacing a requirement to limit the House of Commons to 600 MPs with a new fixed size, set at the current 650. But, as Ron Johnston, David Rossiter and Charles Pattie show, the new rules are just as likely as those they replace to result in major disruption to the constituency map at all future reviews.
In 2011, the coalition government passed the Parliamentary Voting System and Constituencies Act, which changed the rules guiding how the UK’s parliamentary constituencies are drawn up. Boundary reviews were to take place every five years (more frequently than before). Almost all new seats (with four exceptions) were to have electorates within +/-5% of the national quota (the average electorate). And the House of Commons was to be reduced in size from 650 to 600 MPs. To date, the Boundary Commissions have conducted two redistricting exercises under the 2011 Act. Neither review has been implemented: the first was lost to infighting in the coalition, and the second was tabled in September 2018 but has not yet been approved by parliament. The proposed changes they contained would have produced the largest shake-up in Britain’s constituency map in modern times.
Now the redistricting rules look set to change again. The Parliamentary Constituencies Bill 2019-21, published on 20 May, is now moving through its Committee Stage in parliament. It retains the requirements that all constituencies (with four exceptions) should have an electorate within +/-5% of the national average, but changes the number of constituencies to 650 – the argument being that with Brexit there will be more work for MPs, and thus a need for more of them, than if we had remained a member of the EU. If the Bill is passed, the Boundary Commissions will be required to recommend a new set of 650 constituencies by 1 July 2023 – in time for the next general election, due in May 2024. Subsequent reviews will then take place on a slightly longer timetable than under the 2011 Act – every eight years. Continue reading