New Constituency Boundaries for Britain 2018

This page first posted 30 May 2016, updated 28 February 2017

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New Boundaries Introduction

Following the passage of the Parliamentary Voting System and Constituencies Act, the four national Boundary Commissions were asked to undertake the "2018 Review" of contituency boundaries to equalise the size of seat both within and between the four nations of the UK. The Boundary Commissions are independent bodies who put considerable effort into drawing up boundaries in a generally fair way, reflecting local geography and affiliations. There are two consultation periods where comments and objections to the proposals can be brought forward for consideration.

The Boundary Commission of England published its initial set of proposals on 13 September 2016, with final proposals being ready by September 2018. The Welsh Boundary Commission also published their initial proposals on the same day. The Boundary Commission for Northern Ireland published its initial proposals on 6 September 2016. The Scottish Boundary Commission is published its initial proposals on 20 October 2016.

Browsable national map

Click on the map image to go to a full browsable map of the all the seats with initial proposals.

UK New Boundary Seat Map 2018

The total number of seats per consituent part of the country is already known:

AreaOld SeatsNew SeatsChange

This page contains full details of these reviews as they are published.

Executive Summary

The Boundary Commissions have now all published their initial proposals. This allows us to get a good overall view of the likely outcome. In terms of the headline impact on seats nationally the implied result of the 2015 general election, as if it had been run under the new boundaries, is:

 Actual general
election result 2015
Implied result at 2015
under new boundaries

The Conservative majority would increse from 12 seats in the House of Commons to 38.

The analysis below shows which seats "disappear" under the boundary changes, which seats switch party allegiance, and which fresh seats are newly created.

Region by region

Region by region, the net change in seats is shown in this table:

RegionOld SeatsNew SeatsChangeCONLABLIBUKIPGreenNATMIN
East Scotland3229−30−1000−20
West Scotland2724−3−10000−20
Northern Ireland1817−1000000−1
Greater Manchester2726−1−1000000
West Midlands2825−30−300000
East Midlands3835−3−2−100000
East Anglia363600000000
North London3633−31−400000
South London3735−21−300000
South West3129−2−2000000
South East3332−1−1100−100

There are full regional pages of explanation and seat breakdowns available. Just click on the region's name in the left-hand column of the table.

Generally, the regions of northern England and London lose the most seats, while southern England loses fewer seats. Since the former regions are more Labour-leaning than the latter, this is the main driver for the relatively larger losses of Labour seats.

Disappearing Seats

For each proposed new seat, we define the predecessor seat to be the old seat which contributes the most voters to that new seat. Old seats which are not the predecessor of any new seat are said to "disappear". This means that they are split into fragments, and none of those fragments forms the largest part of any new seat.

There are 59 disappearing seats across the country, shown in the table below:

Old SeatPartyCurrent MPCounty/Area
AberavonLABStephen KinnockWest Glamorgan (Wales)
AberconwyCONGuto BebbClwyd (Wales)
AngusSNPMichael WeirTayside (East Scotland)
ArfonPCHywel WilliamsGwynedd (Wales)
Ayrshire CentralSNPPhilippa WhitfordAyrshire and Lanark (West Scotland)
Belfast SouthLABDr Alasdair McDonnellAntrim (Northern Ireland)
Birmingham Hall GreenLABRoger GodsiffBirmingham (West Midlands)
Bournemouth WestCONConor BurnsDorset (South West)
Bradford SouthLABJudith CumminsWest Yorkshire (Yorkshire)
Cardiff CentralLABJo StevensSouth Glamorgan (Wales)
Carmarthen West and Pembrokeshire SouthCONSimon HartDyfed (Wales)
Chelsea and FulhamCONGreg HandsHammersmith and Fulham (North London)
Cornwall NorthCONScott MannCornwall (South West)
DelynLABDavid HansonClwyd (Wales)
Derbyshire North EastLABNatascha EngelDerbyshire (East Midlands)
Dudley NorthLABIan AustinBlack Country (West Midlands)
Edinburgh SouthLABIan MurrayEdinburgh area (East Scotland)
Enfield SouthgateCONDavid BurrowesEnfield (North London)
Faversham and Kent MidCONHelen WhatelyKent (South East)
GedlingLABVernon CoakerNottinghamshire (East Midlands)
Glasgow NorthSNPPatrick GradyGlasgow area (West Scotland)
GowerCONByron DaviesWest Glamorgan (Wales)
Great GrimsbyLABMelanie OnnHumber area (Humberside)
Hackney North and Stoke NewingtonLABDiane AbbottHackney (North London)
Haltemprice and HowdenCONDavid DavisHumber area (Humberside)
Herefordshire NorthCONBill WigginHereford and Worcestershire (Severn)
Houghton and Sunderland SouthLABBridget PhillipsonNewcastle area (North)
Ilford SouthLABMike GapesRedbridge (North London)
IslwynLABChristopher EvansGwent (Wales)
Kenilworth and SouthamCONJeremy WrightWarwickshire (East Midlands)
Kirkcaldy and CowdenbeathSNPRoger MullinFife (East Scotland)
Lancaster and FleetwoodLABCatherine SmithLancashire (Lancashire)
Leeds WestLABRachel ReevesWest Yorkshire (Yorkshire)
Lewisham DeptfordLABVicky FoxcroftLewisham (South London)
Lewisham West and PengeLABJim DowdLewisham (South London)
Liverpool WaltonLABSteve RotheramMerseyside (Lancashire)
Meon ValleyCONGeorge HollingberyHampshire (South)
MiddlesbroughLABAndy McDonaldTeesside (North)
Mitcham and MordenLABSiobhain McDonaghMerton (South London)
MontgomeryshireCONGlyn DaviesPowys (Wales)
Motherwell and WishawSNPMarion FellowsGlasgow area (West Scotland)
Newcastle upon Tyne CentralLABChi OnwurahNewcastle area (North)
Newport EastLABJessica MordenGwent (Wales)
Oldham East and SaddleworthLABDebbie AbrahamsEastern Manchester (Greater Manchester)
PendleCONAndrew StephensonLancashire (Lancashire)
Penistone and StocksbridgeLABAngela SmithSouth Yorkshire (Humberside)
PontypriddLABOwen SmithMid Glamorgan (Wales)
Ross Skye and LochaberSNPIan BlackfordHighland (East Scotland)
StirlingSNPSteven PatersonCentral (East Scotland)
StockportLABAnn CoffeyEastern Manchester (Greater Manchester)
Stockton NorthLABAlex CunninghamTeesside (North)
Stoke-on-Trent CentralLABTristram HuntStaffordshire (Severn)
TattonCONGeorge OsborneCheshire (Severn)
Ulster MidSFFrancie MolloyTyrone (Northern Ireland)
Walsall NorthLABDavid WinnickBlack Country (West Midlands)
WansbeckLABIan LaveryNorthumberland (North)
Wirral SouthLABAlison McGovernMerseyside (Lancashire)
WithamCONPriti PatelEssex (Essex)
WorkingtonLABSue HaymanCumbria (North)

If an MP's name is shown here it does not mean that he or she will stop being an MP at the next election. But they have to change the precise area which they represent, and they may be subject to their party's reselection process.

Switching seats

Some new seats have clear predecessor seats, but the boundary changes are large enough that the new seat contains many voters with a different political outlook. This can cause the new seat to have a different predicted party winner from its predecessor. Such seats are called "switching seats", and there are 35 of them:

Old seatOld
Current MPNew seatNew PartyNew
Amber ValleyCONNigel MillsAlfreton and Clay CrossLAB4,762Derbyshire (East Midlands)
Antrim SouthUUPDanny KinahanAntrim WestDUP7,413Antrim (Northern Ireland)
Barrow and FurnessLABJohn WoodcockBarrow and FurnessCON113Cumbria (North)
Bolton WestCONChris GreenBolton WestLAB2,135Western Manchester (Greater Manchester)
Brentford and IsleworthLABRuth CadburyBrentford and ChiswickCON3,893Hounslow (South London)
BridgendLABMadeleine MoonBridgend and Vale of Glamorgan WestCON1,394Mid Glamorgan (Wales)
Brighton PavilionGreenCaroline LucasBrighton NorthLAB92East Sussex (South East)
Bury NorthCONDavid NuttallBuryLAB461Western Manchester (Greater Manchester)
Cardiff NorthCONCraig WilliamsCardiff NorthLAB304South Glamorgan (Wales)
Chester, City ofLABChris MathesonChester, City ofCON628Cheshire (Severn)
Clwyd SouthLABSusan Elan JonesClwyd South and Montgomeryshire NorthCON5,962Clwyd (Wales)
Coventry North WestLABGeoffrey RobinsonCoventry West and MeridenCON7,488Coventry and Solihull (West Midlands)
Derby NorthCONAmanda SollowayDerby NorthLAB8,325Derbyshire (East Midlands)
Derby SouthLABMargaret BeckettDerby SouthCON2,562Derbyshire (East Midlands)
Dumfriesshire, Clydesdale and TweeddaleCONDavid MundellClydesdale and EskdaleSNP5,590Ayrshire and Lanark (West Scotland)
Enfield NorthLABJoan RyanEnfieldCON781Enfield (North London)
Fermanagh and South TyroneUUPTom ElliottFermanagh and South TyroneSF2,971Fermanagh (Northern Ireland)
Halesowen and Rowley RegisCONJames MorrisBirmingham Selly Oak and HalesowenLAB1,556Birmingham (West Midlands)
HammersmithLABAndy SlaughterHammersmith and FulhamCON7,915Hammersmith and Fulham (North London)
Hampstead and KilburnLABTulip SiddiqHampstead and Golders GreenCON5,811Camden (North London)
Harrow EastCONBob BlackmanKentonLAB1,494Harrow (North London)
Harrow WestLABGareth ThomasHarrow and StanmoreCON5,103Harrow (North London)
Leeds North WestLIBGreg MulhollandLeeds North WestLAB3,313West Yorkshire (Yorkshire)
Londonderry EastDUPGregory CampbellGlenshaneSF3,163Londonderry (Northern Ireland)
Morecambe and LunesdaleCONDavid MorrisLancaster and MorecambeLAB462Lancashire (Lancashire)
Morley and OutwoodCONAndrea JenkynsBatley and MorleyLAB5,061West Yorkshire (Yorkshire)
PudseyCONStuart AndrewPudseyLAB7,531West Yorkshire (Yorkshire)
Sheffield HallamLIBNick CleggSheffield Hallam and StocksbridgeLAB5,318South Yorkshire (Humberside)
Southampton TestLABAlan WhiteheadSouthampton TestCON737Hampshire (South)
SouthportLIBJohn PughSouthportCON2,785Merseyside (Lancashire)
TelfordCONLucy AllanTelfordLAB572Shropshire (Severn)
Upper BannDUPDavid SimpsonUpper Bann and BlackwaterSF2,795Armagh (Northern Ireland)
Vale of ClwydCONJames DaviesFlint and RhuddlanLAB3,984Clwyd (Wales)
Wirral WestLABMargaret GreenwoodBebington and HeswallCON2,666Merseyside (Lancashire)
Ynys MonLABAlbert OwenYnys Mon and ArfonPlaid2,622Gwynedd (Wales)

Freshly created new seats

Although the overall change is to reduce the number of seats, there are a few new seats which are freshly created. This means that the new seat is made up of a number of small fragments from various old seats. If the largest component of the new seat is not the largest part of its corresponding old seat, then the seat is defined to be "fresh". There are nine fresh new seats:

New SeatPartyMajorityCounty/Area
Bramhall and PoyntonCON14,330Eastern Manchester (Greater Manchester)
Down WestDUP5,077Armagh (Northern Ireland)
FalkirkSNP14,051Central (East Scotland)
Forest Gate and LoxfordLAB30,141Newham (North London)
Grimsby North and BartonCON4,499Humber area (Humberside)
Isle of Wight WestCON7,539Hampshire (South)
Kinross-shire and CowdenbeathSNP11,040Fife (East Scotland)
Middlesbrough West and Stockton EastLAB8,775Teesside (North)
Peckham and Lewisham WestLAB20,099Lewisham (South London)


The Boundary Commission for England published initial proposals on 13 September 2016.

The net effect of the changes for England is shown in the following table:

 Old SeatsNew SeatsChangeDisappearSwitch OutSwitch InFresh

Full details are available on the regional pages: North, Lancashire, Greater Manchester, Yorkshire, Humberside, West Midlands, East Midlands, Severn, East Anglia, Essex, West, North London, South London, South West, South, South East.


The Boundary Commission for Wales published initial proposals on 13 September 2016.

The net effect of the changes for Wales is shown in the following table:

 Old SeatsNew SeatsChangeDisappearSwitch OutSwitch InFresh

Visit the Wales Regional page for more details.


The Boundary Commission for Scotland published its initial proposals on 20 October 2016.

The net effect of the changes for Scotland is shown in the following table:

 Old SeatsNew SeatsChangeDisappearSwitch OutSwitch InFresh

Visit the East Scotland and West Scotland regional pages for more details.

Northern Ireland

New parliamentary boundaries were announced on 6 September by the Boundary Commission for Northern Ireland. Analysis of these initial proposals by Electoral Calculus indicates the the Ulster Unionist Party may lose both of its current Westminster seats, and that the republican Sinn Féin is likely to gain two seats, if voting patterns remain stable. The centre-left nationalist SDLP are also expected to lose one seat, as the total number of seats in the province decreases from 18 to 17.

The projected loss of the Ulster Unionist's MPs would be a heavy blow for the century-old party which has historically dominated Northern Ireland politics. Its influential past leaders include James Molyneux and David Trimble, who was the first-ever First Minister of Northern Ireland (1998-2002). Recently it has been eclipsed by the Democratic Unionist Party, founded by Ian Paisley in the 1970s, which is now the largest NI party at Westminster.

The UUP's two current seats are Antrim South, and Fermanagh and South Tyrone. The former is split and mostly becomes the new seat of 'Antrim West' which is predicted to be DUP. The latter seat, whose current UUP majority is only 530 votes, gains nationalist voters from Tyrone West, and is slated to become Sinn Féin's.

Other changes include the dismemberment into fragments of Belfast South (SDLP), and Ulster Mid (SF), which effectively disappear as seats. But Sinn Féin more than compensates for this by taking Upper Bann, and Londonderry East (renamed 'Glenshane') from the DUP. There is also one new seat created called Down West, which is predicted to be won by the DUP.

PartyOld SeatsNew SeatsChangeCommentary
DUP880Lose Londonderry East and Upper Bann;
gain Antrim West, and Down West (new seat)
SF46+2Gain Upper Bann and Blackwater, Glenshane,
Fermanagh and South Tyrone; lose Ulster Mid (disappears)
SDLP32-1Lose Belfast South (disappearing seat)
UUP20-2Lose Antrim South, Fermanagh and South Tyrone
MIN110Hold Down North

Projected New Boundaries (Estimated)

There has been interest in the likely effect of new boundaries which are likely to be brought in under this parliament. Electoral Calculus prepared a full set of notional implied results under the 600-seat "Sixth Periodic review" of boundaries which was conducted around 2013.

Although these boundaries were not used in 2015, they can still give a good approximation of the likely effect of the boundary changes. If we use the actual election result (adjusted slightly to compensate for model deficiencies) and feed it into the user-defined predictor, then we can see the effect of the boundaries.

Using these figures and the old boundaries gives CON 331, LAB 232, LIB 9, UKIP 1, Green 1, SNP 55, and Plaid 3, which is almost exactly correct. Then when we switch to the proposed 2018 boundaries we get


This gives the Conservatives a majority of 56 seats, well ahead of their current majority of 12. This is equivalent of nearly another twenty-two seats for the Conservatives.

Local Election Results and Local Boundaries Update 2015

The seat detail pages now have the new local election results, and updated local ward boundaries where they have changed. This major data upgrade shows clearly the interplay between recent national and local elections, as well as showing more details about the political make-up of each constituency.

You can see these new seat details by going to the index pages on the left-hand menu bar (England A-B, ..., Wales, Scotland, Northern Ireland), or by using the postcode lookup for any UK location:


An example seat is Arundel and South Downs (BN14 0TF) which has had updated boundaries.

Results include the following parties shown separately:

GBConLabLibUKIPGreenSNP/Plaid Other
SNP/PlaidSinn Fein

Local election results used are now:

Since 2010, sixty-two English councils have been given new boundaries by the Local Government Boundary Commission for England (LGBCE), and these new boundaries took effect at the 2015 elections. These new ward boundaries are now included for both the results drilldown and the accompanying maps.

In Northern Ireland, there has been a substantial redrawing of boundaries. There are now 11 district councils, with 462 wards which are grouped into 80 District Electoral Areas (DEAs). The NI local elections were conducted in 2014 using the DEAs, so Northern Ireland mapping and analysis is based on the DEAs rather than the actual wards. Please note that NI mapping data is difficult to obtain freely, so some boundaries may be slightly approximate.

It is expected that the Boundary Commissions will redraw parliamentary constituencies starting from Spring 2016 and using these 2015 local ward boundaries as their basic building blocks.

History of revisions.

The data presented has been revised at various times.

See also the information about the now-abandonned "Sixth Periodic review", to compare against the 2018 Review.