Cambridgeshire South East: New Boundaries 2018 Calculation

Cambridgeshire South East: Overview

Projection: CON seat

Implied MP at 2017:Lucy Frazer  (CON)
County/Area:Cambridgeshire (Anglia)
Electorate:81,338
Turnout:72.9%

PartyImplied 2017 VotesImplied 2017 Share
CON32,47454.8%
LAB16,18027.3%
LIB10,48917.7%
UKIP1150.2%
Green410.1%
CON Majority16,29427.5%

See overview of other seats in Anglia.



Introduction

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

Cambridgeshire South East: Map

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

List of old seats forming part of Cambridgeshire South East

The old seat(s) needed are:

Old seat: Cambridgeshire North West

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

Old seat: Cambridgeshire North WestTransfer-adjusted Results
DistrictWardElectorate
2017		New SeatCON
Votes		LAB
Votes		LIB
Votes		UKIP
Votes		Green
Votes		NAT
Votes		MIN
Votes		OTH
Votes		Total
Votes
HuntingdonshireEarith4,723Cambridgeshire South East2,114710132115410003,112
HuntingdonshireEllington2,414Cambridgeshire North West1,06733415360160001,630
HuntingdonshireElton and Folksworth2,109Cambridgeshire North West9523034253150001,365
HuntingdonshireRamsey6,258Cambridgeshire North West2,8581,150159186510004,404
HuntingdonshireSawtry5,144Cambridgeshire North West2,163848138152420003,343
HuntingdonshireSomersham4,547Cambridgeshire North West2,031719128118390003,035
HuntingdonshireSt Ives East14Huntingdon and St Neots5311000010
HuntingdonshireSt Ives South2Huntingdon and St Neots100000001
HuntingdonshireStilton2,342Cambridgeshire North West1,0713775961190001,587
HuntingdonshireUpwood and The Raveleys2,418Cambridgeshire North West1,16537714663170001,768
HuntingdonshireWarboys and Bury4,786Cambridgeshire North West2,018754235132330003,172
HuntingdonshireYaxley and Farcet8,021Cambridgeshire North West3,3541,737250240670005,648
PeterboroughBarnack2,471Cambridgeshire North West1,0393184452170001,470
PeterboroughFletton and Woodston6,984Peterborough2,8652,3672511401890005,812
PeterboroughGlinton and Wittering4,901Cambridgeshire North West2,428939133169370003,706
PeterboroughNorthborough2,198Cambridgeshire North West9382945153370001,373
PeterboroughOrton Longueville6,180Cambridgeshire North West2,2922,3042272391540005,216
PeterboroughOrton Waterville6,321Cambridgeshire North West2,4791,2751941751220004,245
PeterboroughOrton with Hampton8,971Cambridgeshire North West3,6102,3525652742010007,002
PeterboroughStanground Central7,057Cambridgeshire North West2,1941,8002001981170004,509
PeterboroughStanground East2,138Cambridgeshire North West8815555938410001,574
 Total89,999 37,52519,5163,1672,5191,25500063,982

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

Old seat: Cambridgeshire South East

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

Old seat: Cambridgeshire South EastTransfer-adjusted Results
DistrictWardElectorate
2017		New SeatCON
Votes		LAB
Votes		LIB
Votes		UKIP
Votes		Green
Votes		NAT
Votes		MIN
Votes		OTH
Votes		Total
Votes
East CambridgeshireBottisham3,028Cambridgeshire South East1,230570443000002,243
East CambridgeshireBurwell4,709Cambridgeshire South East1,952893626000003,471
East CambridgeshireCheveley2,970Cambridgeshire South East1,506490261000002,257
East CambridgeshireDullingham Villages1,496Cambridgeshire South East721348157000001,226
East CambridgeshireEly East2,870Cambridgeshire South East1,165638400000002,203
East CambridgeshireEly North4,917Cambridgeshire South East1,9981,270788000004,056
East CambridgeshireEly South2,998Cambridgeshire South East1,247752447000002,446
East CambridgeshireEly West3,294Cambridgeshire South East1,162689596000002,447
East CambridgeshireFordham Villages2,783Cambridgeshire South East1,353494243000002,090
East CambridgeshireHaddenham4,457Cambridgeshire South East1,800822671000003,293
East CambridgeshireIsleham1,789Cambridgeshire South East686376239000001,301
East CambridgeshireSoham North3,535Cambridgeshire South East1,650794385000002,829
East CambridgeshireSoham South4,785Cambridgeshire South East2,0301,106473000003,609
East CambridgeshireStretham3,009Cambridgeshire South East1,357524278000002,159
East CambridgeshireThe Swaffhams1,505Cambridgeshire South East635251222000001,108
South CambridgeshireBalsham3,583Cambridgeshire South East1,517557509000002,583
South CambridgeshireFulbourn3,608Cambridgeshire South1,221727649000002,597
South CambridgeshireHiston and Impington7,640Cambridgeshire South East2,5181,9391,417000005,874
South CambridgeshireLinton3,632Cambridgeshire South1,284657727000002,668
South CambridgeshireMilton3,022Cambridgeshire South East1,070763775000002,608
South CambridgeshireTeversham1,736Cambridgeshire South735592225000001,552
South CambridgeshireThe Wilbrahams2,034Cambridgeshire South East900427194000001,521
South CambridgeshireWaterbeach3,936Cambridgeshire South East1,712741628000003,081
South CambridgeshireWillingham and Over5,221Cambridgeshire South East2,1511,026605000003,782
 Total82,557 33,60017,44611,9580000063,004

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

New seat: Cambridgeshire South East

The new seat of Cambridgeshire South East is made up of the following wards, with the transfer-adjusted votes shown.

New seat: Cambridgeshire South East
DistrictWardElectorate
2017		Old Seat CON
Votes		LAB
Votes		LIB
Votes		UKIP
Votes		Green
Votes		NAT
Votes		MIN
Votes		OTH
Votes		Total
Votes
East CambridgeshireBottisham3,066Cambridgeshire South East1,230570443000002,243
East CambridgeshireBurwell4,745Cambridgeshire South East1,952893626000003,471
East CambridgeshireCheveley3,087Cambridgeshire South East1,506490261000002,257
East CambridgeshireDullingham Villages1,676Cambridgeshire South East721348157000001,226
East CambridgeshireEly East3,012Cambridgeshire South East1,165638400000002,203
East CambridgeshireEly North5,543Cambridgeshire South East1,9981,270788000004,056
East CambridgeshireEly South3,344Cambridgeshire South East1,247752447000002,446
East CambridgeshireEly West3,345Cambridgeshire South East1,162689596000002,447
East CambridgeshireFordham Villages2,856Cambridgeshire South East1,353494243000002,090
East CambridgeshireHaddenham4,500Cambridgeshire South East1,800822671000003,293
East CambridgeshireIsleham1,778Cambridgeshire South East686376239000001,301
East CambridgeshireSoham North3,867Cambridgeshire South East1,650794385000002,829
East CambridgeshireSoham South4,935Cambridgeshire South East2,0301,106473000003,609
East CambridgeshireStretham2,950Cambridgeshire South East1,357524278000002,159
East CambridgeshireThe Swaffhams1,515Cambridgeshire South East635251222000001,108
HuntingdonshireEarith4,535Cambridgeshire North West2,114710132115410003,112
South CambridgeshireBalsham3,530Cambridgeshire South East1,517557509000002,583
South CambridgeshireHiston and Impington8,028Cambridgeshire South East2,5181,9391,417000005,874
South CambridgeshireMilton3,565Cambridgeshire South East1,070763775000002,608
South CambridgeshireThe Wilbrahams2,078Cambridgeshire South East900427194000001,521
South CambridgeshireWaterbeach4,212Cambridgeshire South East1,712741628000003,081
South CambridgeshireWillingham and Over5,171Cambridgeshire South East2,1511,026605000003,782
 Total81,338 32,47416,18010,4891154100059,299

And these are the implied results for 2017 for the new seat of Cambridgeshire South East. 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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