Berwickshire, Roxburgh and Selkirk: New Boundaries 2018 Calculation

Berwickshire, Roxburgh and Selkirk: Overview

Projection: CON seat

Implied MP at 2017:John Lamont  (CON)
County/Area:Borders (Scotland)
Electorate:76,415
Turnout:71.6%

PartyImplied 2017 VotesImplied 2017 Share
CON29,37053.7%
SNP17,96532.8%
LAB4,7518.7%
LIB2,6124.8%
CON Majority11,40520.9%

See overview of other seats in Scotland.



Introduction

This page shows the detail of the calculations performed to estimate the general election result for 2017 had the new boundaries for Berwickshire, Roxburgh and Selkirk 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.

Berwickshire, Roxburgh and Selkirk: Map

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

List of old seats forming part of Berwickshire, Roxburgh and Selkirk

The old seat(s) needed are:

Old seat: Berwickshire, Roxburgh and Selkirk

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

Old seat: Berwickshire, Roxburgh and SelkirkTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
SNP
Votes
MIN
Votes
OTH
Votes
Total
Votes
Scottish BordersEast Berwickshire8,078Berwickshire, Roxburgh and Selkirk3,175774197001,758005,904
Scottish BordersGalashiels and District9,933Berwickshire, Roxburgh and Selkirk3,563928420003,167008,078
Scottish BordersHawick and Denholm6,722Berwickshire, Roxburgh and Selkirk2,781645244001,603005,273
Scottish BordersHawick and Hermitage6,636Berwickshire, Roxburgh and Selkirk2,578568295001,430004,871
Scottish BordersJedburgh and District6,780Berwickshire, Roxburgh and Selkirk2,880287208001,658005,033
Scottish BordersKelso and District8,020Berwickshire, Roxburgh and Selkirk3,463278259001,575005,575
Scottish BordersLeaderdale and Melrose8,173Berwickshire, Roxburgh and Selkirk3,450414323001,828006,015
Scottish BordersMid Berwickshire7,974Berwickshire, Roxburgh and Selkirk3,138233222002,107005,700
Scottish BordersSelkirkshire7,408Berwickshire, Roxburgh and Selkirk2,938336291001,862005,427
Scottish BordersTweeddale East839Berwickshire, Roxburgh and Selkirk24656240016400490
 Total70,563 28,2124,5192,4830017,1520052,366

The full details of these calculations are given on the Berwickshire, Roxburgh and Selkirk seat details page. Click on "Show workings".

Old seat: Dumfriesshire, Clydesdale and Tweeddale

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

Old seat: Dumfriesshire, Clydesdale and TweeddaleTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
SNP
Votes
MIN
Votes
OTH
Votes
Total
Votes
Dumfries and GallowayAnnandale East and Eskdale9,492Dumfriesshire and Lanarkshire South East3,9121,043316001,786007,057
Dumfries and GallowayAnnandale North10,137Dumfriesshire and Lanarkshire South East4,201931284002,040007,456
Dumfries and GallowayAnnandale South10,771Dumfriesshire and Lanarkshire South East3,7302,069388002,077008,264
Dumfries and GallowayLochar2,030Dumfriesshire and Lanarkshire South East;
Galloway and Dumfries
6663074500461001,479
Dumfries and GallowayMid and Upper Nithsdale6,453Dumfriesshire and Lanarkshire South East2,2841,21587001,388004,974
Dumfries and GallowayNith2,050Galloway and Dumfries6794225300470001,624
Scottish BordersTweeddale East7,299Berwickshire, Roxburgh and Selkirk;
Midlothian and Upper Tweeddale
2,630528292001,847005,297
Scottish BordersTweeddale West7,477Midlothian and Upper Tweeddale2,774471348001,912005,505
South LanarkshireClydesdale East6,535Dumfriesshire and Lanarkshire South East2,24849688001,770004,602
South LanarkshireClydesdale South3,471Dumfriesshire and Lanarkshire South East1,0526194900984002,704
 Total65,715 24,1768,1011,9500014,7350048,962

The full details of these calculations are given on the Dumfriesshire, Clydesdale and Tweeddale seat details page. Click on "Show workings".

New seat: Berwickshire, Roxburgh and Selkirk

The new seat of Berwickshire, Roxburgh and Selkirk is made up of the following wards, with the transfer-adjusted votes shown.

New seat: Berwickshire, Roxburgh and Selkirk
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
SNP
Votes
MIN
Votes
OTH
Votes
Total
Votes
Scottish BordersEast Berwickshire8,253Berwickshire, Roxburgh and Selkirk3,175774197001,758005,904
Scottish BordersGalashiels and District11,290Berwickshire, Roxburgh and Selkirk3,563928420003,167008,078
Scottish BordersHawick and Denholm7,369Berwickshire, Roxburgh and Selkirk2,781645244001,603005,273
Scottish BordersHawick and Hermitage6,807Berwickshire, Roxburgh and Selkirk2,578568295001,430004,871
Scottish BordersJedburgh and District7,034Berwickshire, Roxburgh and Selkirk2,880287208001,658005,033
Scottish BordersKelso and District7,793Berwickshire, Roxburgh and Selkirk3,463278259001,575005,575
Scottish BordersLeaderdale and Melrose8,408Berwickshire, Roxburgh and Selkirk3,450414323001,828006,015
Scottish BordersMid Berwickshire7,967Berwickshire, Roxburgh and Selkirk3,138233222002,107005,700
Scottish BordersSelkirkshire7,585Berwickshire, Roxburgh and Selkirk2,938336291001,862005,427
Scottish BordersTweeddale East686Berwickshire, Roxburgh and Selkirk24656240016400490
Scottish BordersTweeddale East3,223Dumfriesshire, Clydesdale and Tweeddale1,15823212900813002,332
 Total76,415 29,3704,7512,6120017,9650054,698

And these are the implied results for 2017 for the new seat of Berwickshire, Roxburgh and Selkirk. 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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