Islington South and Finsbury: New Boundaries 2018 Calculation

Islington South and Finsbury: Overview

 Projection: LAB seat 

Implied MP at 2017: Emily Thornberry  (LAB)
County/Area: Islington (London)
Electorate: 78,880
Turnout: 69.6%

 Implied 2017 VotesImplied 2017 Share
LAB35,23364.2%
CON10,81019.7%
LIB6,28511.4%
Green1,4682.7%
UKIP1,0321.9%
OTH810.1%
LAB Majority24,42344.5%

See overview of other seats in London.

Islington South and Finsbury : Political and Demographic indicators

The table below shows some political and demographic numerical indicators for the new Islington South and Finsbury constituency, the 'London' area and nation.

The political measures include the Left/Right and International/National axes (what does this mean).

The demographic measures are from the 2011 Census and include categories relating to national identity, economic activity, health and education. These categories are those which have the most relevance to political attitudes.

IndicatorSeatLondonAll GB
Party WinnerLABLABCON
Economic Position15° Left2° Left
National Position30° Int15° Int
EU Leave %27%40%52%
British Identity36%38%29%
Good Health52%50%48%
UK Born64%64%88%
Good Education57%48%39%
Good Job75%61%51%
High SEC57%55%51%
Average Age40.344.148.5
ABC1 Class69%62%53%

Islington South and Finsbury ranks #579 for "Leave", #249 for "Right" and #588 for "National" out of 600 new seats.

Indicators: Legend and Descriptions

Indicators : Legend and Descriptions

The colour scheme used in the table above is explained in the legend table below. The eight census indicators (British Identity, Good Health, UK Born, Good Education, Good Job, High SEC, Average Age and AB1 Class) all use the same 'Census' colour scheme indicating whether the area's level is above or below the national average.

TopicCat 1Cat 2Cat 3Cat 4Cat 5
Economic PositionVery LeftLeftCentristRightVery Right
National PositionVery IntInternationalCentristNationalVery Nat
EU Leave %Very RemainRemainBalancedLeaveVery Leave
CensusVery LowLowMediumHighVery High

Indicator definitions are given in terms of political data definitions or census categories:

IndicatorCensus
Question
Definition / Included Census Categories
Party WinnerArea party winner : actual election result or projected by Electoral Calculus
Economic PositionEconomic position between 100° Left and 100° Right, estimated by Electoral Calculus from political and demographic data.
National PositionNational position between 100° International and 100° National, estimated by Electoral Calculus from political and demographic data.
EU Leave %EU Referendum vote share for 'Leave' : actual result or estimate
British IdentityNational Identity (KS202)Those answering British, British-Other, or Scottish-British
Good HealthHealth (KS301)Those answering 'Very Good Health'
UK BornCountry of Birth (QS203)Those answering England, Northern Ireland, Scotland, Wales, GB Other, or UK Other
Good EducationHighest level of Qualification (QS501)Level 3 (A-level equivalent) or Level 4+ (degree equivalent)
Good JobOccupation (QS606)Occupation codes 1xx to 4xx (Managers, Professionals, Associates, and office workers)
High SECNS-SeC of Household Reference Person (QS609)National Statistics Socio-economic Classification from 1 to 4 (higher managers and professionals, lower managers and professionals, intermediate occupations, small employers and self-employed).
Average AgeAge (QS103)Average age of adults (18 years and above)
ABC1 ClassApproximated Social Grade (QS611)Approximated social grades A, B and C1

Islington South and Finsbury: Map

Boundary Lines courtesy of Ordnance Survey OpenData © Crown copyright 2015

Introduction

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

List of old seats forming part of Islington South and Finsbury

The old seat(s) needed are:

Old seat: Islington North

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

Old seat: Islington NorthTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
IslingtonFinsbury Park10,365Finsbury Park and Stoke Newington7525,9545123529500617,609
IslingtonHighbury East8,431Finsbury Park and Stoke Newington8884,0568619026300306,188
IslingtonHighbury West10,885Finsbury Park and Stoke Newington1,2615,7156083333300417,991
IslingtonHillrise8,481Finsbury Park and Stoke Newington7164,4597313924500346,224
IslingtonJunction8,727Camden and St Pancras8944,6894653626700556,406
IslingtonMildmay9,346Islington South and Finsbury8865,04547610227100816,861
IslingtonSt George's8,972Camden and St Pancras7684,6997843626700326,586
IslingtonTollington9,622Finsbury Park and Stoke Newington7055,4695104228800497,063
 Total74,829 6,87040,0864,9474132,2290038354,928

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

Old seat: Islington South and Finsbury

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

Old seat: Islington South and FinsburyTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
IslingtonBarnsbury8,327Islington South and Finsbury1,3413,591598821420005,754
IslingtonBunhill9,719Islington South and Finsbury1,5184,0547002791650006,716
IslingtonCaledonian9,463Islington South and Finsbury1,2854,3626321041560006,539
IslingtonCanonbury8,237Islington South and Finsbury1,1273,434901941360005,692
IslingtonClerkenwell7,835Islington South and Finsbury1,0263,242913891450005,415
IslingtonHolloway10,224Islington South and Finsbury1,0544,8888311161750007,064
IslingtonSt Mary's7,884Islington South and Finsbury1,2553,348623811410005,448
IslingtonSt Peter's7,845Islington South and Finsbury1,3183,269611851370005,420
 Total69,534 9,92430,1885,8099301,19700048,048

The full details of these calculations are given on the Islington South and Finsbury seat details page. Click on "Show workings".

New seat: Islington South and Finsbury

The new seat of Islington South and Finsbury is made up of the following wards, with the transfer-adjusted votes shown.

New seat: Islington South and Finsbury
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
IslingtonBarnsbury8,327Islington South and Finsbury1,3413,591598821420005,754
IslingtonBunhill9,719Islington South and Finsbury1,5184,0547002791650006,716
IslingtonCaledonian9,463Islington South and Finsbury1,2854,3626321041560006,539
IslingtonCanonbury8,237Islington South and Finsbury1,1273,434901941360005,692
IslingtonClerkenwell7,835Islington South and Finsbury1,0263,242913891450005,415
IslingtonHolloway10,224Islington South and Finsbury1,0544,8888311161750007,064
IslingtonMildmay9,346Islington North8865,04547610227100816,861
IslingtonSt Mary's7,884Islington South and Finsbury1,2553,348623811410005,448
IslingtonSt Peter's7,845Islington South and Finsbury1,3183,269611851370005,420
 Total78,880 10,81035,2336,2851,0321,468008154,909

And these are the implied results for 2017 for the new seat of Islington South and Finsbury. 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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