Sixth Periodic Review of Westminster constituencies

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The Sixth Periodic Review of Westminster constituencies, also known as the 2013 Review, 2018 Review,[1] or just boundary changes,[2] is the process by which constituencies of the House of Commons of the United Kingdom (since 1955 all being single seats) are being reviewed and redistributed. The Review is being carried out by the four UK boundary commissions to meet the revised rules for the number and size (electoral quota) of constituencies. The changes include having a total of 600 seats rather than 650, as agreed by Parliament in 2011 to meet a reformist aim of the 2010–2015 coalition agreement.

The process began in 2011 and was intended to be completed by 2013. A January 2013 vote in the House of Commons effectively killed the process, two years after it was begun by the four national commissions. The process recommenced in 2016 with completion due in 2018.

Current status[edit]

The four Boundary Commissions submitted their Final Recommendations to the Secretary of State on 5 September 2018,[3][4] and made their reports public a week later.[5][6][7][8] Leader of the House of Commons Andrea Leadsome told the House on the 13 September 2018 that "it will be some time" to create the necessary Statutory Instruments.[9]


The process was launched on 4 March 2011 by the Boundary Commission for England,[10] Boundary Commission for Scotland,[11] Boundary Commission for Northern Ireland[12] and Boundary Commission for Wales.[13] The changes were to be implemented by virtue of the Parliamentary Voting System and Constituencies Act 2011, which amended the Parliamentary Constituencies Act 1986. Part II of the act (henceforth referred to as 'PVSaCA') deals with the amendments to the manner in which House of Commons constituencies are formed by the individual boundary commissions. Each commission was obliged to make a final report to the Secretary of State before 1 October 2013 (by virtue of Section 10, Clause 3, which amends Subsection 2 of Section 3 of the 1986 Act).

Following a debate in the House of Lords on 14 January 2013, the Opposition tabled and voted for an amendment to legislation to postpone the date by which the Review ends, which they passed and sent back to the Commons, on a relatively small 69-vote majority.[14][15] A Commons vote on 29 January 2013 in agreement meant the review instead began after May 2015 for completion in 2018.[16] The Review had been required for completion by October 2013 under the principles of Section 3 of the Parliamentary Constituencies Act 1986 (themselves loosening previous requirements by instead calling for periodic reviews every eight to twelve years) as left intact by Part 2 of the Parliamentary Voting System and Constituencies Act 2011. The Electoral Registration and Administration Act 2013 superseded these principles to make an exception for this Review, delaying it until 2018.

Following the 2015 election, the majority Conservative government considered the boundary review as a priority.[17][18] In July 2015, then Prime Minister David Cameron reiterated his plan to go ahead with reducing the number of Members of Parliament and "cut the cost of politics",[19] saying the proposals were "the right approach".[20] In 2016 each of the four parliamentary boundary commissions of the United Kingdom re-commenced the review process.[21][22][23][24]

The Conservatives won the most seats at the general election in June 2017. The party's manifesto included a pledge to carry on with the review process and reduce the number of MPs to 600.[25] In February 2018, Prime Minister Theresa May was urged by the Public Administration and Constitutional Affairs Committee to deal with the boundary review process as a matter of priority.[26]

Changes to review process[edit]

The original legislation made several significant changes to the way constituencies were to be reviewed.

Number of constituencies: PVSaCA requires there to be exactly six hundred parliamentary constituencies (Schedule 2, clause 1) – a reduction of 50 from the total fought at the 2010 General Election. This is the first time a precise number has been included in legislation.

More equal constituencies: with a few specified exceptions for island areas (see below), the size (electorate) of all constituencies must be within 5% above or below the target number.

Increased frequency of reviews: the first review was to be completed by 2013 so that a general election held in 2015 would have been contested on the new boundaries. The legislation requires a review every five years after that date, rather than every twelve to fifteen years as previously. To ensure this timetable is achievable, the reviews will take place over the whole country simultaneously, rather than being phased over several years as in the past.

Protected constituencies[edit]

Four island constituencies are 'protected' by PVSaCA. They are:


2011 review[edit]

The four commissions adopted consistent procedures for developing their boundary proposals, starting with simultaneous announcements in March 2011 which began the review process.

In each part of the UK, the relevant commission first published "Provisional Proposals", accessible on the Web and viewable at local council offices. There was a twelve-week period from the moment of publication during which the public could comment on the proposals, whether supporting, opposing or suggesting an alternative. During this period, public hearings held across the country allowed those representations to be made in public: all written comments received were made public after the end of the twelve-week period.

The commissions then considered all representations, and the resulting Revised Recommendations were to be published for further public consultation (8 weeks), though without a second public hearing. The commissions would then decide on their final proposals.

The Scottish commission gave the following expected timetable for the process which was temporarily halted;[27] the timings in the three other countries were expected to be similar. The English commission began its public consultations on 11 October 2011 in Manchester, and concluded on 17/18 November in Darlington, and Exeter.[28]

  • Start of review: March 2011
  • Initial Proposals consultation (12 weeks): September/October 2011 – January 2012
  • Public Hearings: October/ November 2011
  • Scrutiny of representations: Spring 2012
  • Revised Proposals consultation (8 weeks): November 2012 – January 2013
  • Report submission: Summer 2013

The four commissions would have been required to present their reports by October 2013. The government had hoped that the reports would then be approved by Parliament and in place for the May 2015 general election. In January 2013, the Government lost a vote on this timetable, which effectively ended the entire process.[29]

2018 review[edit]

In July 2016 the Boundary Commission for England published its guide to the 2018 review.[30] In it, the date for publishing provisional recommendations was set at the week beginning 12 September 2016. The Welsh Commission aimed to publish their Initial Proposals on 13 September 2016.[31]

Number of seats[edit]

The total of 600 constituencies required by the Act were allocated between the four countries of the UK as shown in the table below. The English Boundary Commission then announced that the number of constituencies allocated to England would be sub-divided by region, with the aim of producing "initial proposals in which each constituency is wholly contained within a single region". The seats allocated to each region are also shown below.

Across the United Kingdom[edit]

Nation 2010/15/17 seats 2011 review[32] 2018 review[33]
Electorate Allocation Change Average size Electorate Allocation Change Average size
England * 532 38,332,557 500 −32 76,665 37,294,494 499 −33 74,738
(Isle of Wight) 1 110,924 2 +1 55,462 105,448 2 +1 52,724
Northern Ireland 18 1,190,635 16 −2 74,415 1,243,369 17 −1 73,139
Scotland * 57 3,873,387 50 −7 77,468 3,842,736 51 −6 75,348
(Orkney and Shetland) 1 33,755 1 33,755 33,229 1 33,229
(Na h-Eileanan an Iar) 1 21,837 1 21,837 20,887 1 20,887
Wales 40 2,281,596 30 −10 76,053 2,181,841 29 −11 75,236
Total 650 45,844,691 600 −50 76,408 44,562,440 600 −50 74,270
* Excluding the protected island areas

Across the regions of England[edit]

Region 2010/15/17 seats 2011 review[34] 2018 review[1][35]
Electorate Allocation Change Average size Electorate Allocation Change Average size
Eastern 58 4,280,707 56 −2 76,441 4,242,266 57 −1 74,426
East Midlands 46 3,361,089 44 −2 76,388 3,275,046 44 −2 74,433
London 73 5,266,904 68 −5 77,454 5,118,884 68 −5 75,278
North East 29 1,971,249 26 −3 75,817 1,874,396 25 −4 74,976
North West 75 5,253,019 68 −7 77,250 5,074,302 68 −7 74,622
South East * 83 6,192,504 81 −2 76,450 6,067,475 81 −2 74,907
South West 55 4,042,475 53 −2 76,273 3,930,770 53 −2 74,165
West Midlands 59 4,115,668 54 −5 76,216 3,989,320 53 −6 75,270
Yorkshire and the Humber 54 3,848,942 50 −4 76,979 3,722,035 50 −4 74,441
Total 532* 38,332,557 500 −32 76,665 37,294,494 499 –33 74,738
* Excluding the protected Isle of Wight

Practical considerations[edit]

The four commissions published descriptions of how they would carry out their work, and held meetings with representatives of political parties to explain their approach in the light of the more restrictive rules to which they have to work.

For example, the Boundary Commission for England stated in its 2011 newsletter; "The Commission wishes to make very clear that those with an interest in the review process should understand that the defined number of constituencies and the 5% electoral parity target are statutory requirements that it must apply and that it has absolutely no discretion in respect of either matter."[36]

In February 2016 the BCE released conclusions from a meeting with representatives from political parties, confirming that the 2013 review would not be used as the basis for the 2018 review and they would consider splitting electoral wards where necessary.[37] In July 2016 the English commission explained their policy towards splitting electoral wards as;

...The BCE recognises that in a few cases there may be exceptional and compelling circumstances...that may make it appropriate to divide a ward. Strong evidence and justification will need to be provided in any constituency scheme that proposes to split a ward, and the number of such ward splits should be kept to an absolute minimum. Examples of circumstances in which the BCE might propose splitting a ward could include: a) where all the possible ‘whole ward’ options in an area would significantly cut across local ties; or b) where splitting a single ward may prevent a significant ‘domino effect’ of otherwise unnecessary change to a chain of constituencies[38]

Size of constituencies[edit]

In Great Britain, constituencies can have no less an electorate than 72,810 and no more than 80,473.[36][39] The quota in Northern Ireland is slightly different, with a fixed minimum of 70,583 and a fixed maximum of 80,473.[40]

The quota does not apply if the area of a constituency is larger than 12,000 square kilometres (4,630 sq mi) (new Schedule 2, Rule 4(2)). No constituency can be larger than 13,000 square kilometres (5,020 sq mi) (new Schedule 2, Rule 4(1)).

Composition of constituencies[edit]

Westminster constituencies are usually created by combining entire electoral wards. For the 2013 Review, the Boundary Commission for England said in its newsletter that whilst it had used entire electoral wards in the past, the new legislation and fixed electorate quota made that harder. Therefore, it aimed to use polling districts in circumstances where using entire wards was not possible, and said "it is prepared to take into account as appropriate any new ward boundaries that have been introduced after 6 May 2010".[41] The English Commission outlined that it was "focused on getting all constituencies within the statutory range, rather than as close as possible to the electoral quota figure itself".

At a meeting held in February 2016, the Boundary Commission for Wales confirmed it would recommend 29 constituencies in September of that year.[42] In the same meeting the Commission said it would "avoid splitting electoral wards and communities where it was possible to do so".

The Scottish Commission expected few, if any, existing constituencies to remain unchanged and new seats "probably not" all to be constructed from complete electoral wards.[43] The Northern Ireland Commission expected "few, if any" constituencies to remain the same.[40]

Provisional recommendations (2011 review)[edit]

England (2011)[edit]

For the aborted 2011 review, the Boundary Commission for England released its "Initial Proposals" to the public on 13 September 2011.[44] Their provisional recommendations did not require division of any electoral ward.

Amongst the proposals, former Prime Minister David Cameron (Witney) and former Leader of the Opposition Ed Miliband (Doncaster North) would have seen their seats remain intact with no changes. Former Deputy Prime Minister Nick Clegg's seat of Sheffield Hallam would have been altered into the proposed "Sheffield West and Penistone".

The Isle of Wight was to be divided into two almost equal halves. The so-called Devonwall constituency, sharing wards between neighbouring Devon and Cornwall, was suggested as "Bideford and Bude".

Scotland (2011)[edit]

The Initial Proposal from the Boundary Commission for Scotland was released at midnight on 13 October 2011.[45] Amongst their proposals were six prefixed by the word "Glasgow", a reduction of one across the city. Former Liberal Democrat leader Charles Kennedy's seat of Ross, Skye and Lochaber was to be divided between three other seats covering the Highlands, and Argyll and Bute. Former Prime Minister Gordon Brown's seat, Kirkcaldy and Cowdenbeath, would also have been redrawn into a newly configured "Kirkcaldy and Glenrothes". Public consultation closed in January 2012.

Northern Ireland (2011)[edit]

On 13 September 2011, the Northern Ireland Commission proposed to reduce the number of Belfast seats by one, and create a newly formed "Glenshane", named after the Glenshane Pass.[46][47][48] The official response of the Democratic Unionist Party criticised the proposals as having 'the stench of gerrymander' and having 'a disproportionately negative impact upon Unionism'.[49] The Ulster Unionist Party identified 'particular disquiet' in specific towns as a result of the provisional proposals but accepted that there was 'limited room for manoeuvre'.[50]

Wales (2011)[edit]

The Boundary Commission for Wales released its provisional recommendations on 11 January 2012.[51] Cardiff had its representation cut by one, the Isle of Anglesey was joined with Bangor and Bethesda in a new seat styled Menai ac Ynys Môn, and Merthyr Tydfil was brought into a new constituency named 'Heads of the Valley'. Four electoral wards were to be divided between constituencies.

Revised recommendations (2011 review)[edit]

There was a statutory eight-week consultation period for responding to revised recommendations, if any are required.

England (2011 revised)[edit]

Revised recommendations for the English regions were published on 16 October.[52] Unlike in the initial proposals, the Commission split (or divided) some electoral wards between seats,[53] specifically in Tewkesbury and Gloucester.[54][55] Additionally, the Isle of Wight was divided east/west[56] and the cross-border Devon-Cornwall proposed seat considered some sort of 'Devonwall seat' by local critics arguing the difference between the counties trumps the ideals of equal apportionment, was modified to bear proposed name 'Bideford, Bude and Launceston'.[57]

Scotland (2011 revised)[edit]

The Boundary Commission for Scotland released its revised recommendations on 13 September 2012.[58] Of the 50 mainland constituencies initially recommended, 24 went unchanged, thirteen only had new boundaries recommended and five had both boundaries and names changed, whilst eight were just given new names ('Ayr North, Troon and Cumnock', 'Ayrshire Central and Arran', 'Edinburgh South East', 'Galloway, Ayr South and Carrick', 'Glasgow South', 'Inverclyde and Renfrewshire West', 'Renfrewshire South and Ayrshire North', and 'West Dunbartonshire and Bearsden North').

Northern Ireland (2011 revised)[edit]

On 16 October 2012, the Northern Irish Commission confirmed alterations to their proposed Antrim, Fermanagh and Tyrone seats.[59]

Wales (2011 revised)[edit]

Revised recommendations for Wales were published on 24 October.[60] Almost all the initial proposals were altered, so as to place Machynlleth in a 'Brecon, Radnor and Montgomery' seat, and to rename proposed constituencies across North Wales as Ynys Môn a Bangor, 'Conwy and Colwyn', and 'Flint and North Denbighshire'.[60]

Provisional recommendations (2018 review)[edit]

England (2018)[edit]

The Boundary Commission for England confirmed its provisional recommendations on 13 September 2016. Among significant changes put forward, much of the Islington North constituency represented by leader of the opposition Labour Party Jeremy Corbyn is proposed to become part of a new Finsbury Park and Stoke Newington constituency.[61][62]

Scotland (2018)[edit]

The Scottish proposals were published in October 2016.[63] The changes include reducing the number of seats in Glasgow by one.[64]

Wales (2018)[edit]

The Welsh Commission published its recommendations on 13 September 2016, reducing the number of constituencies by over a quarter.[65] Most seats are given English names while six are recommended to be given Welsh names, namely Ynys Môn ac Arfon, Gogledd Clwyd a Gwynedd, De Clwyd a Gogledd Sir Faldwyn, Llanelli a Lliw, Caerfyrddin and Ceredigion a Gogledd Sir Benfro.[66]

Northern Ireland (2018)[edit]

Provisional recommendations were published by the Boundary Commission for Northern Ireland on 6 September 2016. While Belfast would lose one of its four seats, six new constituencies would be created, which have been provisionally called "Dalriada", "Glenshane", "North Tyrone", "Upper Bann and Blackwater", "West Antrim" and "West Down".[67]

Revised recommendations (2018 review)[edit]

Revised boundary proposals for Northern Ireland were published on 30 January 2018, following two consultation periods on the provisional recommendations.[68] Belfast was restored to four proposed constituencies, while revisions elsewhere resulted in only three (rather than six) new constituency names: "Causeway", "Mid Antrim" and "Mid Down".[69] The Scottish Commission opened up consultation for its Revised recommendations between October and December 2017.[70]

The Welsh Commission published its Revised proposals in October 2017, retaining their decision to give constituencies "dual" names in both English and Welsh.[71] The English Commission's revised proposals consultation closed in December 2017.[72]

Political and economic impact and controversy[edit]

The review was not without controversy. A spokesperson for the opposition Labour Party told the BBC "political motives" were behind the changes when they were introduced.[73] Labour's former Shadow Scottish Secretary, Ann McKechin, called the process "gerrymandering".[74] whilst her successor Margaret Curran criticised "Nick Clegg's plan to gerrymander Scotland".[75] Former Conservative Minister Sir Malcolm Rifkind labelled the proposals "a muddle".[76] Labour MP for Preston, Mark Hendrick, labelled the proposals "gerrymandering to curry political persuasion".[77]

In June 2011, research company Democratic Audit published its findings about the review of constituency boundaries. The organisation attempted to create a set of boundaries for the UK according to the new rules, and to examine their political consequences. Their studies suggested that the Liberal Democrats could lose "a quarter" of their current seats.[78][79] Provisional notional results published in January 2012 calculated that the Conservatives could have won 299 seats under the new boundaries.[80]

In August 2012 the House of Lords Reform Bill 2012 was dropped by the Government, after disagreements between members of the Conservative and Liberal Democrat parties. In response, Deputy Prime Minister Nick Clegg confirmed that he would instruct his MPs to vote against the Sixth Periodic Review,[81] although David Cameron vowed to pass the necessary orders regardless.[82][83]

On 30 October, an amendment to the Electoral Registration and Administration Bill was tabled by Labour and Liberal Democrat peers which would postpone the Sixth Periodic Review until 2018.[84] On the following day, Labour peer Lord Hart, crossbencher Lord Kerr, Liberal Democrat peer Lord Rennard, and former Plaid Cymru leader Lord Wigley tabled an amendment to the same Bill to postpone the Sixth Review until 2018.[85][86] During 14 January debate, Deputy Prime Minister Nick Clegg received personal criticism of the position Lords found themselves in: former Scottish Secretary Lord Forsyth accused Clegg of "going from 'cross' to 'double cross'"[87]

In October 2012, Lord Wallace told the House of Lords that the boundary commissions had spent £5.8 million as of August 2012 and would spend a further £3.8 million from September 2012 until the end of the Review.[88]

The Parliamentary Constituencies (Amendment) Bill 2017-19, most recently debated in 2017, aims to replace the Sixth Periodic Review with an entirely new process in time for the Next United Kingdom general election.[89]

Termination of original review[edit]

On 31 January 2013 the four commissions issued statements announcing that they would not be continuing with the review. The English Boundary Commission officially closed their portion of the Sixth Periodic Review.[90] The Boundary Commission for Scotland closed its part of the review confirming they would not be completing it.[91] The Boundary Commission for Northern Ireland also announced they had ended the review and would not be reporting to the Secretary of State for Northern Ireland.[92] The Boundary Commission for Wales stated they were cancelling the review, and would not finalise the development of their recommendations.[93]

See also[edit]


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  64. ^ "Scotland constituency changes branded outrageous and undemocratic". The Guardian. 20 October 2016.
  65. ^ "Boundary Commission map cuts Welsh MPs by a quarter". BBC News Online. 13 September 2016. Retrieved 13 September 2016.
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  68. ^ "2018 Review". Boundary Commission for Northern Ireland. 2016-02-16. Retrieved 2018-01-31.
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  70. ^ Revised Proposals Boundary Commission for Scotland
  71. ^ (PDF). Boundary Commission for Wales Retrieved 28 March 2018. Missing or empty |title= (help)
  72. ^ . Boundary Commission for England Retrieved 28 March 2018. Missing or empty |title= (help)
  73. ^ "House of Commons seat shake-up plan to see fewer MPs". BBC News Online. 4 March 2011. Retrieved 31 December 2011.
  74. ^ "Fury at 'gerrymandering' as seven Scottish seats axed at Westminster". The Scotsman.
  75. ^ Black, Andrew (12 October 2011). "Boundary Commission announces plan to cut Scottish MPs". BBC News Online. Retrieved 31 December 2011.
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  77. ^ "Odd results in MP boundary changes". Lancashire Evening Post. 13 September 2011.
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  86. ^ "Plan to axe MPs in disarray after House of Lords defeat". BBC News Online. 14 January 2013.
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  89. ^ Parliamentary Constituencies Amendment Bill Documents Parliament
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  93. ^ "Statement Regarding the 2013 Review of Parliamentary Constituencies". Boundary Commission for Wales. 31 January 2013. Archived from the original on 21 September 2013. Retrieved 8 February 2013.

External links[edit]