Devon North: New Boundaries 2018 Calculation

Devon North: Overview

Projection: CON seat

Implied MP at 2017:Peter Heaton-Jones  (CON)
County/Area:Devon (South West)
Electorate:75,783
Turnout:73.5%

PartyImplied 2017 VotesImplied 2017 Share
CON25,51645.8%
LIB21,18638.0%
LAB7,06212.7%
UKIP1,1872.1%
Green7561.4%
CON Majority4,3307.8%

See overview of other seats in South West.



Introduction

This page shows the detail of the calculations performed to estimate the general election result for 2017 had the new boundaries for Devon North 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.

Devon North: Map

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

List of old seats forming part of Devon North

The old seat(s) needed are:

Old seat: Devon North

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

Old seat: Devon NorthTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
North DevonBickington and Roundswell3,523Devon North1,2643441,00796370002,748
North DevonBishop's Nympton1,715Devon North55213341017190001,131
North DevonBratton Fleming1,668Devon North69812938815160001,246
North DevonBraunton East3,208Devon North1,11520896030300002,343
North DevonBraunton West3,403Devon North1,22628590435210002,471
North DevonCentral Town3,468Devon North9924251,40737460002,907
North DevonChittlehampton2,010Devon North76514642752180001,408
North DevonChulmleigh1,827Devon North67811737440160001,225
North DevonCombe Martin3,243Devon North1,27625575235340002,352
North DevonForches and Whiddon Valley3,035Devon North8774811,30633390002,736
North DevonFremington3,609Devon North1,111402895125380002,571
North DevonGeorgeham and Mortehoe2,881Devon North1,10418689328280002,239
North DevonHeanton Punchardon1,522Devon North1,00612043419160001,595
North DevonIlfracombe Central3,229Devon North1,16655781497430002,677
North DevonIlfracombe East1,972Devon North69017950422140001,409
North DevonIlfracombe West3,468Devon North9964601,181102390002,778
North DevonInstow1,244Devon North558632361010000877
North DevonLandkey, Swimbridge and Taw4,003Devon North1,49528796089340002,865
North DevonLongbridge3,378Devon North1,24126685236310002,426
North DevonLynton and Lynmouth1,391Devon North53495333159000986
North DevonMarwood1,565Devon North5507246711110001,111
North DevonNewport3,557Devon North1,2503581,06836430002,755
North DevonNorth Molton1,753Devon North84010233915140001,310
North DevonPilton3,455Devon North9033481,29935410002,626
North DevonSouth Molton3,904Devon North1,1864091,22945470002,916
North DevonWitheridge1,942Devon North65217450522220001,375
North DevonYeo Valley3,267Devon North7914611,24290400002,624
 Total73,240 25,5167,06221,1861,18775600055,707

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

New seat: Devon North

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

New seat: Devon North
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
North DevonBickington and Roundswell3,739Devon North1,2643441,00796370002,748
North DevonBishop's Nympton1,538Devon North55213341017190001,131
North DevonBratton Fleming1,695Devon North69812938815160001,246
North DevonBraunton East3,188Devon North1,11520896030300002,343
North DevonBraunton West3,361Devon North1,22628590435210002,471
North DevonCentral Town3,955Devon North9924251,40737460002,907
North DevonChittlehampton1,916Devon North76514642752180001,408
North DevonChulmleigh1,665Devon North67811737440160001,225
North DevonCombe Martin3,200Devon North1,27625575235340002,352
North DevonForches and Whiddon Valley3,723Devon North8774811,30633390002,736
North DevonFremington3,497Devon North1,111402895125380002,571
North DevonGeorgeham and Mortehoe3,044Devon North1,10418689328280002,239
North DevonHeanton Punchardon2,169Devon North1,00612043419160001,595
North DevonIlfracombe Central3,642Devon North1,16655781497430002,677
North DevonIlfracombe East1,918Devon North69017950422140001,409
North DevonIlfracombe West3,779Devon North9964601,181102390002,778
North DevonInstow1,194Devon North558632361010000877
North DevonLandkey, Swimbridge and Taw3,896Devon North1,49528796089340002,865
North DevonLongbridge3,301Devon North1,24126685236310002,426
North DevonLynton and Lynmouth1,341Devon North53495333159000986
North DevonMarwood1,512Devon North5507246711110001,111
North DevonNewport3,749Devon North1,2503581,06836430002,755
North DevonNorth Molton1,781Devon North84010233915140001,310
North DevonPilton3,574Devon North9033481,29935410002,626
North DevonSouth Molton3,966Devon North1,1864091,22945470002,916
North DevonWitheridge1,870Devon North65217450522220001,375
North DevonYeo Valley3,570Devon North7914611,24290400002,624
 Total75,783 25,5167,06221,1861,18775600055,707

And these are the implied results for 2017 for the new seat of Devon North. 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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