Ceredigion and North Pembrokeshire: New Boundaries 2018 Calculation

Ceredigion and North Pembrokeshire: Overview

Projection: Plaid seat

Implied MP at 2017:Ben Lake  (Plaid)
County/Area:Dyfed (Wales)
Electorate:75,201
Turnout:74.2%

PartyImplied 2017 VotesImplied 2017 Share
Plaid14,35125.7%
CON13,79224.7%
LAB13,05323.4%
LIB12,65022.7%
UKIP8721.6%
Green5941.1%
MIN2890.5%
OTH1620.3%
Plaid Majority5591.0%

See overview of other seats in Wales.



Introduction

This page shows the detail of the calculations performed to estimate the general election result for 2017 had the new boundaries for Ceredigion and North Pembrokeshire been in force at that time. The basic idea of the calculation is to look at the district council wards which make up the new seat, and estimate how they voted in 2017. This estimate is based on the recent local election results in those wards, with adjustments made to allow for different turnouts and different voting patterns for local and general elections.

In many cases, wards are divided between several old constituencies or between new constituencies. So the same ward may be shown more than once, but the electorate shown will reflect that ward sub-section.

Election results from a recent local election are given. This is usually the local election closest to 2015 from the period 2012-2015. For multiple-member wards, the votes shown are the sum of the votes cast for all candidates of each party. A negative number indicates candidate(s) elected unopposed.

Calculation method

There are two problems with using the raw (actual) local election results to imply general election results ward-by-ward. Firstly, turnout can be different between local and general elections, which means that the total number of local votes cast does not equal the number of votes cast in each old seat at the general election. To correct for this, we adjust the local votes to match the general election turnout. Each ward's result is scaled, whilst keeping constant the percentage support for each party, so that the total turnout adds up to the old seat's general election turnout. All wards in the old seat are assumed to have the same percentage turnout.

Secondly, even though we now have the correct number of votes in the old seat, the party totals will not match the general election result. Some parties do better at the local election than the general election, and others do vice versa. We call these strong and weak parties respectively. The next step is to transfer votes from strong parties to weak parties. This is done by taking votes proportionally away from strong parties and putting them in a transfer pool. For instance if a party got 12,500 local votes, but only 10,000 general election votes, it will lose 20% over all the wards. These votes in each ward will be put in the ward's transfer pool and allocated to the weak parties. Weak parties will get votes transferred to them in proportion to the votes they need over the old seat. For instance, if two weak parties need 4,000 and 1,000 votes respectively, the first party will get 80% of each ward's transfer pool and the second party will get 20% of each ward's transfer pool. The transfer of votes between parties is done using the Electoral Calculus Transition Model.

More details of the calculation formulas are available.

Ceredigion and North Pembrokeshire: Map

Boundary Lines courtesy of Ordnance Survey OpenData © Crown copyright 2015, Map © OpenStreetMap contributors

List of old seats forming part of Ceredigion and North Pembrokeshire

The old seat(s) needed are:

Old seat: Carmarthen East and Dinefwr

The table shows the transfer-adjusted results for each ward in the old seat of Carmarthen East and Dinefwr, as well as showing which new seat each ward is in.

Old seat: Carmarthen East and DinefwrTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
Plaid
Votes
MIN
Votes
OTH
Votes
Total
Votes
CarmarthenshireAbergwili1,799Carmarthen39928525320604001,345
CarmarthenshireAmmanford1,861Carmarthen28366242390543001,569
CarmarthenshireBetws1,730Carmarthen31855825310323001,255
CarmarthenshireCenarth1,570Ceredigion and North Pembrokeshire33925732270632001,287
CarmarthenshireCilycwm1,145Carmarthen3332151722027700864
CarmarthenshireCynwyl Gaeo1,260Carmarthen2861661418043500919
CarmarthenshireGarnant1,486Carmarthen25362125310305001,235
CarmarthenshireGlanamman1,720Carmarthen27246227300569001,360
CarmarthenshireGorslas3,384Carmarthen62787351590756002,366
CarmarthenshireLlanddarog1,570Carmarthen36223822260512001,160
CarmarthenshireLlandeilo2,234Carmarthen49345455460656001,704
CarmarthenshireLlandovery1,980Carmarthen58042237410488001,568
CarmarthenshireLlandybie3,107Carmarthen60289559600661002,277
CarmarthenshireLlanegwad1,887Carmarthen40327224300676001,405
CarmarthenshireLlanfihangel Aberbythych1,417Carmarthen28820820230522001,061
CarmarthenshireLlanfihangel-ar-Arth2,098Carmarthen40534228370832001,644
CarmarthenshireLlangadog1,544Carmarthen35329834290393001,107
CarmarthenshireLlangeler2,546Ceredigion and North Pembrokeshire51043532450945001,967
CarmarthenshireLlangunnor2,049Carmarthen34229933300635001,339
CarmarthenshireLlangyndeyrn2,550Carmarthen40040744420874001,767
CarmarthenshireLlanybydder1,922Carmarthen44644134420656001,619
CarmarthenshireManordeilo and Salem1,709Carmarthen43731723330507001,317
CarmarthenshirePenygroes2,143Carmarthen36963748400577001,671
CarmarthenshirePontamman2,047Carmarthen33770344380451001,573
CarmarthenshireQuarter Bach2,108Carmarthen33362537400652001,687
CarmarthenshireSaron3,028Carmarthen57179648570922002,394
CarmarthenshireSt Ishmael2,097Carmarthen43833340380722001,571
 Total53,991 10,77912,221920986016,1250041,031

The full details of these calculations are given on the Carmarthen East and Dinefwr seat details page. Click on "Show workings".

Old seat: Ceredigion

The table shows the transfer-adjusted results for each ward in the old seat of Ceredigion, as well as showing which new seat each ward is in.

Old seat: CeredigionTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
Plaid
Votes
MIN
Votes
OTH
Votes
Total
Votes
CeredigionAberaeron946Ceredigion and North Pembrokeshire13212735311911201745
CeredigionAberporth1,614Ceredigion and North Pembrokeshire30826529223163590101,273
CeredigionAberteifi / Cardigan-Mwldan1,222Ceredigion and North Pembrokeshire160190266161032201965
CeredigionAberteifi / Cardigan-Rhyd-y-Fuwch766Ceredigion and North Pembrokeshire7813725710711301603
CeredigionAberteifi / Cardigan-Teifi773Ceredigion and North Pembrokeshire6614718110819601609
CeredigionAberystwyth Bronglais1,381Ceredigion and North Pembrokeshire1682172421419420091,089
CeredigionAberystwyth Canol / Central1,577Ceredigion and North Pembrokeshire1482815141524254091,245
CeredigionAberystwyth Gogledd / North1,827Ceredigion and North Pembrokeshire1903174782028402061,441
CeredigionAberystwyth Penparcau2,074Ceredigion and North Pembrokeshire1913854342523573061,637
CeredigionAberystwyth Rheidol1,729Ceredigion and North Pembrokeshire20331844521273350141,363
CeredigionBeulah1,094Ceredigion and North Pembrokeshire16814217114935702863
CeredigionBorth1,373Ceredigion and North Pembrokeshire2612493001919228071,083
CeredigionCapel Dewi882Ceredigion and North Pembrokeshire13713014512826103696
CeredigionCeulanamaesmawr1,274Ceredigion and North Pembrokeshire1631573181216337011,004
CeredigionCiliau Aeron1,314Ceredigion and North Pembrokeshire1991653271411318011,035
CeredigionFaenor1,687Ceredigion and North Pembrokeshire1992265622020299031,329
CeredigionLampeter1,946Ceredigion and North Pembrokeshire1916853352323269081,534
CeredigionLlanarth1,074Ceredigion and North Pembrokeshire16114227312825001847
CeredigionLlanbadarn Fawr - Padarn684Ceredigion and North Pembrokeshire771051217921900538
CeredigionLlanbadarn Fawr - Sulien1,583Ceredigion and North Pembrokeshire1722532781721500081,249
CeredigionLlandyfriog1,217Ceredigion and North Pembrokeshire242158188151134401959
CeredigionLlandysilio-gogo1,333Ceredigion and North Pembrokeshire2992182781913216061,049
CeredigionLlandysul Town943Ceredigion and North Pembrokeshire13814315012828903743
CeredigionLlanfarian1,024Ceredigion and North Pembrokeshire15112922111828700807
CeredigionLlanfihangel Ystrad1,388Ceredigion and North Pembrokeshire1871903171612370031,095
CeredigionLlangeitho998Ceredigion and North Pembrokeshire16514431612913506787
CeredigionLlangybi974Ceredigion and North Pembrokeshire122131203111128901768
CeredigionLlanrhystyd1,062Ceredigion and North Pembrokeshire15113538511914303837
CeredigionLlansantffraed1,583Ceredigion and North Pembrokeshire3052613752319258071,248
CeredigionLlanwenog1,230Ceredigion and North Pembrokeshire194180202151136404970
CeredigionLledrod1,449Ceredigion and North Pembrokeshire2702583172117253071,143
CeredigionMelindwr1,343Ceredigion and North Pembrokeshire1701823021414376011,059
CeredigionNew Quay707Ceredigion and North Pembrokeshire232100120868802556
CeredigionPen-parc1,527Ceredigion and North Pembrokeshire2612212782015403051,203
CeredigionPenbryn1,334Ceredigion and North Pembrokeshire2401802281612371051,052
CeredigionTirymynach1,282Ceredigion and North Pembrokeshire1931574091310226011,009
CeredigionTrefeurig1,167Ceredigion and North Pembrokeshire162167212151334804921
CeredigionTregaron807Ceredigion and North Pembrokeshire10712113510725501636
CeredigionTroedyraur873Ceredigion and North Pembrokeshire13914015512923203690
CeredigionYstwyth1,372Ceredigion and North Pembrokeshire2051674311412252011,082
 Total50,433 7,3058,02011,51460354111,623015639,762

The full details of these calculations are given on the Ceredigion seat details page. Click on "Show workings".

Old seat: Montgomeryshire

The table shows the transfer-adjusted results for each ward in the old seat of Montgomeryshire, as well as showing which new seat each ward is in.

Old seat: MontgomeryshireTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
Plaid
Votes
MIN
Votes
OTH
Votes
Total
Votes
PowysBanwy746Clwyd South and North Montgomeryshire286841290103600545
PowysBerriew1,064Clwyd South and North Montgomeryshire420991740114900753
PowysBlaen Hafren1,782Brecon, Radnor and Montgomery84813622001866001,288
PowysCaersws1,712Brecon, Radnor and Montgomery72019027702072001,279
PowysChurchstoke1,214Brecon, Radnor and Montgomery373973490124200873
PowysDolforwyn1,587Brecon, Radnor and Montgomery63614522701559001,082
PowysForden1,083Brecon, Radnor and Montgomery509891500103400792
PowysGlantwymyn1,558Ceredigion and North Pembrokeshire57716926801982001,115
PowysGuilsfield1,799Clwyd South and North Montgomeryshire68818230602177001,274
PowysKerry1,563Brecon, Radnor and Montgomery67614022401569001,124
PowysLlanbrynmair742Ceredigion and North Pembrokeshire26581116083100501
PowysLlandinam1,063Brecon, Radnor and Montgomery4121101820135200769
PowysLlandrinio1,656Clwyd South and North Montgomeryshire65817327401665001,186
PowysLlandysilio1,387Clwyd South and North Montgomeryshire5271462250135000961
PowysLlanfair Caereinion1,227Clwyd South and North Montgomeryshire4621393120146000987
PowysLlanfihangel872Clwyd South and North Montgomeryshire33778132083100586
PowysLlanfyllin1,147Clwyd South and North Montgomeryshire5001221550134900839
PowysLlanidloes2,070Brecon, Radnor and Montgomery80627737202991001,575
PowysLlanrhaeadr-ym-Mochnant / Llansilin1,733Clwyd South and North Montgomeryshire78613021001677001,219
PowysLlansantffraid1,511Clwyd South and North Montgomeryshire67712419801444001,057
PowysLlanwddyn818Clwyd South and North Montgomeryshire30186130094200568
PowysMachynlleth1,627Ceredigion and North Pembrokeshire54626631302676001,227
PowysMeifod1,040Clwyd South and North Montgomeryshire3961011610115000719
PowysMontgomery1,059Brecon, Radnor and Montgomery4081111790134200753
PowysNewtown Central2,103Brecon, Radnor and Montgomery99638033102666001,799
PowysNewtown East1,391Brecon, Radnor and Montgomery321211438017139001,126
PowysNewtown Llanllwchaiarn North1,726Brecon, Radnor and Montgomery45817053201858001,236
PowysNewtown Llanllwchaiarn West1,361Brecon, Radnor and Montgomery6141341880144000990
PowysNewtown South1,242Brecon, Radnor and Montgomery34440323301640001,036
PowysRhiwcynon1,674Brecon, Radnor and Montgomery65817127401776001,196
PowysTrewern1,054Clwyd South and North Montgomeryshire4501091700103700776
PowysWelshpool Castle954Clwyd South and North Montgomeryshire3892102010144500859
PowysWelshpool Gungrog1,772Clwyd South and North Montgomeryshire57028061402064001,548
PowysWelshpool Llanerchyddol1,652Clwyd South and North Montgomeryshire45720152601749001,250
 Total46,989 18,0715,5448,79005231,9600034,888

The full details of these calculations are given on the Montgomeryshire seat details page. Click on "Show workings".

Old seat: Preseli Pembrokeshire

The table shows the transfer-adjusted results for each ward in the old seat of Preseli Pembrokeshire, as well as showing which new seat each ward is in.

Old seat: Preseli PembrokeshireTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
Plaid
Votes
MIN
Votes
OTH
Votes
Total
Votes
PembrokeshireBurton1,401Pembrokeshire Mid and South50340116230383211,014
PembrokeshireCamrose1,992Pembrokeshire Mid and South68251527290705111,375
PembrokeshireCilgerran1,396Ceredigion and North Pembrokeshire51242526240884211,118
PembrokeshireClydau1,105Ceredigion and North Pembrokeshire35527313150125100791
PembrokeshireCrymych1,918Ceredigion and North Pembrokeshire602467262902134311,381
PembrokeshireDinas Cross1,210Ceredigion and North Pembrokeshire4173497616061150934
PembrokeshireFishguard North East1,399Ceredigion and North Pembrokeshire47041927240424111,024
PembrokeshireFishguard North West1,094Ceredigion and North Pembrokeshire2734504917041271858
PembrokeshireGoodwick1,335Ceredigion and North Pembrokeshire395485721801152001,105
PembrokeshireHaverfordwest: Castle1,466Pembrokeshire Mid and South41974331180582411,294
PembrokeshireHaverfordwest: Garth1,539Pembrokeshire Mid and South57077039300424111,493
PembrokeshireHaverfordwest: Portfield1,642Pembrokeshire Mid and South60055145310594011,327
PembrokeshireHaverfordwest: Prendergast1,467Pembrokeshire Mid and South47748236260573011,109
PembrokeshireHaverfordwest: Priory1,731Pembrokeshire Mid and South60357745320583911,355
PembrokeshireJohnston1,867Pembrokeshire Mid and South63058833310564211,381
PembrokeshireLetterston1,706Pembrokeshire Mid and South72042921220483511,276
PembrokeshireLlangwm1,724Pembrokeshire Mid and South61051231280554711,284
PembrokeshireLlanrhian1,155Pembrokeshire Mid and South3793111917050281805
PembrokeshireMaenclochog2,248Pembrokeshire Mid and South768603313502314711,716
PembrokeshireMartletwy423Pembrokeshire Mid and South173965501690304
PembrokeshireMerlin's Bridge1,478Pembrokeshire Mid and South46462128240483111,217
PembrokeshireMilford: Central1,389Pembrokeshire Mid and South425440272601414411,104
PembrokeshireMilford: East1,436Pembrokeshire Mid and South37770319220392311,184
PembrokeshireMilford: Hakin1,672Pembrokeshire Mid and South50357134320524311,236
PembrokeshireMilford: Hubberston1,738Pembrokeshire Mid and South41681829280483211,372
PembrokeshireMilford: North1,854Pembrokeshire Mid and South79757328290504211,520
PembrokeshireMilford: West1,441Pembrokeshire Mid and South423575252701702001,240
PembrokeshireNewport812Ceredigion and North Pembrokeshire2642244312068221634
PembrokeshireNeyland: East1,697Pembrokeshire Mid and South39271723180321201,194
PembrokeshireNeyland: West1,511Pembrokeshire Mid and South42667021210373511,211
PembrokeshireRudbaxton816Pembrokeshire Mid and South296164810018140510
PembrokeshireScleddau1,076Ceredigion and North Pembrokeshire4052591615096230814
PembrokeshireSolva1,144Pembrokeshire Mid and South43842326200775611,041
PembrokeshireSt David's1,413Pembrokeshire Mid and South45040537230722811,016
PembrokeshireSt Dogmaels1,647Ceredigion and North Pembrokeshire557474272701134611,245
PembrokeshireSt Ishmael's1,049Pembrokeshire Mid and South4022861316034251777
PembrokeshireThe Havens1,118Pembrokeshire Mid and South4053232117045311843
PembrokeshireWiston1,494Pembrokeshire Mid and South70530112120481901,097
 Total54,603 18,30317,9931,10584902,7111,2092942,199

The full details of these calculations are given on the Preseli Pembrokeshire seat details page. Click on "Show workings".

New seat: Ceredigion and North Pembrokeshire

The new seat of Ceredigion and North Pembrokeshire is made up of the following wards, with the transfer-adjusted votes shown.

New seat: Ceredigion and North Pembrokeshire
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
Plaid
Votes
MIN
Votes
OTH
Votes
Total
Votes
CarmarthenshireCenarth1,754Carmarthen East and Dinefwr33925732270632001,287
CarmarthenshireLlangeler2,683Carmarthen East and Dinefwr51043532450945001,967
CeredigionAberaeron992Ceredigion13212735311911201745
CeredigionAberporth1,693Ceredigion30826529223163590101,273
CeredigionAberteifi / Cardigan-Mwldan1,282Ceredigion160190266161032201965
CeredigionAberteifi / Cardigan-Rhyd-y-Fuwch803Ceredigion7813725710711301603
CeredigionAberteifi / Cardigan-Teifi811Ceredigion6614718110819601609
CeredigionAberystwyth Bronglais1,448Ceredigion1682172421419420091,089
CeredigionAberystwyth Canol / Central1,654Ceredigion1482815141524254091,245
CeredigionAberystwyth Gogledd / North1,916Ceredigion1903174782028402061,441
CeredigionAberystwyth Penparcau2,175Ceredigion1913854342523573061,637
CeredigionAberystwyth Rheidol1,813Ceredigion20331844521273350141,363
CeredigionBeulah1,147Ceredigion16814217114935702863
CeredigionBorth1,440Ceredigion2612493001919228071,083
CeredigionCapel Dewi925Ceredigion13713014512826103696
CeredigionCeulanamaesmawr1,336Ceredigion1631573181216337011,004
CeredigionCiliau Aeron1,378Ceredigion1991653271411318011,035
CeredigionFaenor1,769Ceredigion1992265622020299031,329
CeredigionLampeter2,041Ceredigion1916853352323269081,534
CeredigionLlanarth1,126Ceredigion16114227312825001847
CeredigionLlanbadarn Fawr - Padarn717Ceredigion771051217921900538
CeredigionLlanbadarn Fawr - Sulien1,660Ceredigion1722532781721500081,249
CeredigionLlandyfriog1,276Ceredigion242158188151134401959
CeredigionLlandysilio-gogo1,398Ceredigion2992182781913216061,049
CeredigionLlandysul Town989Ceredigion13814315012828903743
CeredigionLlanfarian1,074Ceredigion15112922111828700807
CeredigionLlanfihangel Ystrad1,456Ceredigion1871903171612370031,095
CeredigionLlangeitho1,047Ceredigion16514431612913506787
CeredigionLlangybi1,021Ceredigion122131203111128901768
CeredigionLlanrhystyd1,114Ceredigion15113538511914303837
CeredigionLlansantffraed1,660Ceredigion3052613752319258071,248
CeredigionLlanwenog1,290Ceredigion194180202151136404970
CeredigionLledrod1,520Ceredigion2702583172117253071,143
CeredigionMelindwr1,408Ceredigion1701823021414376011,059
CeredigionNew Quay741Ceredigion232100120868802556
CeredigionPen-parc1,601Ceredigion2612212782015403051,203
CeredigionPenbryn1,399Ceredigion2401802281612371051,052
CeredigionTirymynach1,344Ceredigion1931574091310226011,009
CeredigionTrefeurig1,224Ceredigion162167212151334804921
CeredigionTregaron846Ceredigion10712113510725501636
CeredigionTroedyraur916Ceredigion13914015512923203690
CeredigionYstwyth1,439Ceredigion2051674311412252011,082
PembrokeshireCilgerran1,551Preseli Pembrokeshire51242526240884211,118
PembrokeshireClydau1,098Preseli Pembrokeshire35527313150125100791
PembrokeshireCrymych1,916Preseli Pembrokeshire602467262902134311,381
PembrokeshireDinas Cross1,295Preseli Pembrokeshire4173497616061150934
PembrokeshireFishguard North East1,420Preseli Pembrokeshire47041927240424111,024
PembrokeshireFishguard North West1,189Preseli Pembrokeshire2734504917041271858
PembrokeshireGoodwick1,535Preseli Pembrokeshire395485721801152001,105
PembrokeshireNewport878Preseli Pembrokeshire2642244312068221634
PembrokeshireScleddau1,130Preseli Pembrokeshire4052591615096230814
PembrokeshireSt Dogmaels1,727Preseli Pembrokeshire557474272701134611,245
PowysGlantwymyn1,622Montgomeryshire57716926801982001,115
PowysLlanbrynmair730Montgomeryshire26581116083100501
PowysMachynlleth1,784Montgomeryshire54626631302676001,227
 Total75,201 13,79213,05312,65087259414,35128916255,763

And these are the implied results for 2017 for the new seat of Ceredigion and North Pembrokeshire. Please note that the wards used are those of 2015 in order to be consistent with those used by the Boundary Commissions.


© 2024 Electoral Calculus Ltd
Powered by TigerLib (14-Mar-2024 12:19, Py3L, sc1)