Willesden and Shepherd's Bush: New Boundaries 2018 Calculation

Willesden and Shepherd's Bush: Overview

Projection: LAB seat

Implied MP at 2017:Dawn Butler  (LAB)
County/Area:Brent (London)
Electorate:85,585
Turnout:67.7%

PartyImplied 2017 VotesImplied 2017 Share
LAB41,80572.1%
CON11,90420.5%
LIB2,7784.8%
Green1,0261.8%
UKIP4230.7%
OTH400.1%
LAB Majority29,90151.6%

See overview of other seats in London.



Introduction

This page shows the detail of the calculations performed to estimate the general election result for 2017 had the new boundaries for Willesden and Shepherd's Bush 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.

Willesden and Shepherd's Bush: Map

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

List of old seats forming part of Willesden and Shepherd's Bush

The old seat(s) needed are:

Old seat: Brent Central

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

Old seat: Brent CentralTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
BrentDollis Hill7,699Wembley1,1213,61725238610005,089
BrentDudden Hill8,250Wembley1,1644,0623121221010005,761
BrentHarlesden8,447Willesden and Shepherd's Bush9355,201260621040006,562
BrentKensal Green7,766Willesden and Shepherd's Bush1,0594,076312521030005,602
BrentMapesbury8,228Willesden and Shepherd's Bush1,3424,022384361250005,909
BrentStonebridge9,896Willesden and Shepherd's Bush8725,21222945720006,430
BrentTokyngton9,540Wembley1,3764,01126236660005,751
BrentWelsh Harp7,633Wembley1,3033,588174117600005,242
BrentWillesden Green7,440Willesden and Shepherd's Bush1,0394,419333491100005,950
 Total74,899 10,21138,2082,51855780200052,296

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

Old seat: Hammersmith

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

Old seat: HammersmithTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
Hammersmith and FulhamAddison6,616Hammersmith and Fulham1,7932,94826825520015,087
Hammersmith and FulhamAskew8,162Willesden and Shepherd's Bush1,3914,2614104214100156,260
Hammersmith and FulhamAvonmore and Brook Green6,509Hammersmith and Fulham1,9642,93437059530015,381
Hammersmith and FulhamCollege Park and Old Oak4,930Willesden and Shepherd's Bush7953,02915027800014,082
Hammersmith and FulhamFulham Reach6,651Hammersmith and Fulham1,7072,88827571400014,982
Hammersmith and FulhamHammersmith Broadway6,935Hammersmith and Fulham1,3863,432344674900135,291
Hammersmith and FulhamNorth End6,477Hammersmith and Fulham1,6213,05832660480015,114
Hammersmith and FulhamRavenscourt Park6,632Hammersmith and Fulham1,8302,465301461080074,757
Hammersmith and FulhamShepherd's Bush Green6,837Willesden and Shepherd's Bush1,1383,872203761190025,410
Hammersmith and FulhamWormholt and White City7,777Willesden and Shepherd's Bush1,0984,487155341120035,889
 Total67,526 14,72333,3742,802507802004552,253

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

Old seat: Hampstead and Kilburn

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

Old seat: Hampstead and KilburnTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
BrentBrondesbury Park7,552Willesden and Shepherd's Bush2,2353,22634206000195,882
BrentKilburn9,522Paddington and Queen's Park1,4005,45836207900607,359
BrentQueens Park8,846Paddington and Queen's Park1,7234,62049007900116,923
CamdenBelsize7,099Hampstead2,0683,09446608500315,744
CamdenFortune Green7,116Hampstead1,6113,11449507800125,310
CamdenFrognal and Fitzjohns6,160Hampstead2,6752,36530106800125,421
CamdenHampstead Town6,609Hampstead2,1282,42343007800135,072
CamdenKilburn7,369Hampstead1,0943,87640807100105,459
CamdenSwiss Cottage7,459Hampstead2,4123,0113230680065,820
CamdenWest Hampstead7,245Hampstead1,5563,27748307600225,414
 Total74,977 18,90234,4644,10007420019658,404

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

New seat: Willesden and Shepherd's Bush

The new seat of Willesden and Shepherd's Bush is made up of the following wards, with the transfer-adjusted votes shown.

New seat: Willesden and Shepherd's Bush
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
BrentBrondesbury Park8,355Hampstead and Kilburn2,2353,22634206000195,882
BrentHarlesden10,142Brent Central9355,201260621040006,562
BrentKensal Green8,659Brent Central1,0594,076312521030005,602
BrentMapesbury9,135Brent Central1,3424,022384361250005,909
BrentStonebridge9,941Brent Central8725,21222945720006,430
BrentWillesden Green9,200Brent Central1,0394,419333491100005,950
Hammersmith and FulhamAskew8,720Hammersmith1,3914,2614104214100156,260
Hammersmith and FulhamCollege Park and Old Oak5,688Hammersmith7953,02915027800014,082
Hammersmith and FulhamShepherd's Bush Green7,539Hammersmith1,1383,872203761190025,410
Hammersmith and FulhamWormholt and White City8,206Hammersmith1,0984,487155341120035,889
 Total85,585 11,90441,8052,7784231,026004057,976

And these are the implied results for 2017 for the new seat of Willesden and Shepherd's Bush. 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, sc1364)