Bassetlaw: New Boundaries 2018 Calculation

Bassetlaw: Overview

Projection: LAB seat

Implied MP at 2017:John Mann  (LAB)
County/Area:Nottinghamshire (East Midlands)
Electorate:78,534
Turnout:66.5%

PartyImplied 2017 VotesImplied 2017 Share
LAB27,46852.6%
CON22,61643.3%
LIB1,1542.2%
MIN1,0151.9%
LAB Majority4,8529.3%

See overview of other seats in East Midlands.



Introduction

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

Bassetlaw: Map

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

List of old seats forming part of Bassetlaw

The old seat(s) needed are:

Old seat: Bassetlaw

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

Old seat: BassetlawTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
BassetlawBeckingham1,863Bassetlaw685383170006401,149
BassetlawBlyth1,817Bassetlaw695374410002301,133
BassetlawCarlton4,437Bassetlaw1,2901,449480004002,827
BassetlawClayworth1,505Bassetlaw68124310000170951
BassetlawEast Retford East5,273Bassetlaw1,5081,944660007003,588
BassetlawEast Retford North4,887Bassetlaw1,1941,775640005803,091
BassetlawEast Retford South3,515Bassetlaw7741,269490003202,124
BassetlawEast Retford West3,483Bassetlaw9931,2631340005602,446
BassetlawEverton1,898Bassetlaw771305490002201,147
BassetlawHarworth5,726Bassetlaw1,4352,453500006804,006
BassetlawLangold1,910Bassetlaw437754200002201,233
BassetlawMisterton2,008Bassetlaw658482190008001,239
BassetlawRanskill1,846Bassetlaw798349490001901,215
BassetlawSturton1,816Bassetlaw618442170007601,153
BassetlawSutton1,656Bassetlaw1,096388690002001,573
BassetlawWelbeck1,533Bassetlaw610399390001101,059
BassetlawWorksop East4,760Bassetlaw1,1381,953690003603,196
BassetlawWorksop North6,476Bassetlaw1,7862,6061040005904,555
BassetlawWorksop North East4,836Bassetlaw1,1901,823670003503,115
BassetlawWorksop North West5,300Bassetlaw1,4502,281700005503,856
BassetlawWorksop South5,132Bassetlaw1,5431,831510004403,469
BassetlawWorksop South East5,087Bassetlaw1,2662,7025200010804,128
 Total76,764 22,61627,4681,1540001,015052,253

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

New seat: Bassetlaw

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

New seat: Bassetlaw
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
BassetlawBeckingham1,728Bassetlaw685383170006401,149
BassetlawBlyth1,701Bassetlaw695374410002301,133
BassetlawCarlton4,249Bassetlaw1,2901,449480004002,827
BassetlawClayworth1,429Bassetlaw68124310000170951
BassetlawEast Retford East5,394Bassetlaw1,5081,944660007003,588
BassetlawEast Retford North4,645Bassetlaw1,1941,775640005803,091
BassetlawEast Retford South3,193Bassetlaw7741,269490003202,124
BassetlawEast Retford West3,677Bassetlaw9931,2631340005602,446
BassetlawEverton1,724Bassetlaw771305490002201,147
BassetlawHarworth6,020Bassetlaw1,4352,453500006804,006
BassetlawLangold1,853Bassetlaw437754200002201,233
BassetlawMisterton1,862Bassetlaw658482190008001,239
BassetlawRanskill1,826Bassetlaw798349490001901,215
BassetlawSturton1,732Bassetlaw618442170007601,153
BassetlawSutton2,366Bassetlaw1,096388690002001,573
BassetlawWelbeck1,592Bassetlaw610399390001101,059
BassetlawWorksop East4,805Bassetlaw1,1381,953690003603,196
BassetlawWorksop North6,846Bassetlaw1,7862,6061040005904,555
BassetlawWorksop North East4,683Bassetlaw1,1901,823670003503,115
BassetlawWorksop North West5,794Bassetlaw1,4502,281700005503,856
BassetlawWorksop South5,212Bassetlaw1,5431,831510004403,469
BassetlawWorksop South East6,203Bassetlaw1,2662,7025200010804,128
 Total78,534 22,61627,4681,1540001,015052,253

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