Warwick and Leamington: New Boundaries 2018 Calculation

Warwick and Leamington: Overview

Projection: CON seat

Implied MP at 2017:Unknown (changed seat)  (CON)
County/Area:Warwickshire (West Midlands)
Electorate:84,566
Turnout:73.4%

PartyImplied 2017 VotesImplied 2017 Share
CON29,33047.3%
LAB27,09543.7%
LIB3,3555.4%
Green1,3822.2%
UKIP8831.4%
CON Majority2,2353.6%

See overview of other seats in West Midlands.



Introduction

This page shows the detail of the calculations performed to estimate the general election result for 2017 had the new boundaries for Warwick and Leamington 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.

Warwick and Leamington: Map

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

List of old seats forming part of Warwick and Leamington

The old seat(s) needed are:

Old seat: Kenilworth and Southam

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

Old seat: Kenilworth and SouthamTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
RugbyDunsmore5,618Rugby and Southam3,0151,171281611160004,644
RugbyLeam Valley1,918Rugby and Southam1,1282847316320001,533
Stratford On AvonBishop's Itchington2,771Rugby and Southam1,57760017428490002,428
Stratford On AvonHarbury2,649Rugby and Southam1,20653630826500002,126
Stratford On AvonKineton2,536Stratford-on-Avon1,29045515563480002,011
Stratford On AvonLong Itchington and Stockton2,949Rugby and Southam1,48261919427250002,347
Stratford On AvonNapton and Fenny Compton2,548Rugby and Southam1,30544918863230002,028
Stratford On AvonRed Horse1,320Stratford-on-Avon680208693111000999
Stratford On AvonSnitterfield13Stratford-on-Avon7210000010
Stratford On AvonSoutham North2,440Rugby and Southam1,10470617774240002,085
Stratford On AvonSoutham South2,565Rugby and Southam1,24060313772480002,100
Stratford On AvonWellesbourne East2,843Stratford-on-Avon1,39257432974500002,419
Stratford On AvonWellesbourne West2,446Stratford-on-Avon1,10548224527380001,897
WarwickAbbey5,292Coventry South and Kenilworth2,2051,1386751361150004,269
WarwickArden4,289Warwick and Leamington2,64959116131690003,501
WarwickManor1,356Warwick and Leamington54930916311260001,058
WarwickMilverton237Warwick and Leamington90613225000190
WarwickPark Hill6,455Coventry South and Kenilworth3,1041,484573611400005,362
WarwickRadford Semele2,065Rugby and Southam1,0704648920370001,680
WarwickSt John's6,546Coventry South and Kenilworth2,9871,481709631410005,381
WarwickStoneleigh and Cubbington4,024Warwick and Leamington2,02290618942830003,242
 Total62,880 31,20713,1234,9229281,13000051,310

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

Old seat: Warwick and Leamington

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

Old seat: Warwick and LeamingtonTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
WarwickAylesford4,618Warwick and Leamington1,7521,35014527670003,341
WarwickBishop's Tachbrook2,012Warwick and Leamington8365413714250001,453
WarwickBrunswick4,682Warwick and Leamington1,4122,623151521080004,346
WarwickBudbrooke4,705Warwick and Leamington2,1331,0738275630003,426
WarwickClarendon4,046Warwick and Leamington1,5161,63428729950003,561
WarwickCrown4,452Warwick and Leamington1,1622,003276111810003,633
WarwickEmscote4,575Warwick and Leamington1,2981,795238101840003,516
WarwickLeam3,401Warwick and Leamington1,1391,64811527780003,007
WarwickManor3,638Warwick and Leamington1,4441,00020022550002,721
WarwickMilverton4,170Warwick and Leamington1,5081,30727724830003,199
WarwickMyton and Heathcote3,804Warwick and Leamington1,6001,10715765560002,985
WarwickNewbold4,029Warwick and Leamington1,5541,35024824780003,254
WarwickSaltisford4,968Warwick and Leamington1,6791,80221937850003,822
WarwickSydenham4,119Warwick and Leamington1,3792,2349246680003,819
WarwickWhitnash6,394Warwick and Leamington2,1262,538155611150004,995
WarwickWoodloes4,050Warwick and Leamington1,4821,22313182580002,976
 Total67,663 24,02025,2282,8107971,19900054,054

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

New seat: Warwick and Leamington

The new seat of Warwick and Leamington is made up of the following wards, with the transfer-adjusted votes shown.

New seat: Warwick and Leamington
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
WarwickArden4,526Kenilworth and Southam2,64959116131690003,501
WarwickAylesford4,588Warwick and Leamington1,7521,35014527670003,341
WarwickBishop's Tachbrook1,996Warwick and Leamington8365413714250001,453
WarwickBrunswick5,967Warwick and Leamington1,4122,623151521080004,346
WarwickBudbrooke4,704Warwick and Leamington2,1331,0738275630003,426
WarwickClarendon4,891Warwick and Leamington1,5161,63428729950003,561
WarwickCrown4,989Warwick and Leamington1,1622,003276111810003,633
WarwickEmscote4,829Warwick and Leamington1,2981,795238101840003,516
WarwickLeam4,130Warwick and Leamington1,1391,64811527780003,007
WarwickManor1,368Kenilworth and Southam54930916311260001,058
WarwickManor3,737Warwick and Leamington1,4441,00020022550002,721
WarwickMilverton245Kenilworth and Southam90613225000190
WarwickMilverton4,393Warwick and Leamington1,5081,30727724830003,199
WarwickMyton and Heathcote4,101Warwick and Leamington1,6001,10715765560002,985
WarwickNewbold4,468Warwick and Leamington1,5541,35024824780003,254
WarwickSaltisford5,251Warwick and Leamington1,6791,80221937850003,822
WarwickStoneleigh and Cubbington4,190Kenilworth and Southam2,02290618942830003,242
WarwickSydenham5,246Warwick and Leamington1,3792,2349246680003,819
WarwickWhitnash6,860Warwick and Leamington2,1262,538155611150004,995
WarwickWoodloes4,087Warwick and Leamington1,4821,22313182580002,976
 Total84,566 29,33027,0953,3558831,38200062,045

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


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