West: New Constituency Boundaries 2018

Each new seat can be described as a combination of parts of old seats. These tables show this decomposition. The winner of the old seat at the 2015 election is shown by party colour, as is the implied winner of the new seat.

The implied results are calculated using the local election results for the wards which make up each old seat. This should give the most accurate projection, since it reflects varying political behaviour across the seat.

West Change Table

  Old SeatsNew SeatsChangeDisappearSwitch OutSwitch InFresh

The table shows how the various changes affect each party in this region. The total old and new seats are shown for each party, as well as their difference ('Change'). The change in seats is also explained through the four explanations:

Bristol area

New seatPrimary componentSecondary component(s)
Bath 100% of Bath 18.4% of Somerset North East
Bristol East 100% of Bristol East 10.3% of Bristol West
Bristol North West Unchanged
Bristol South Unchanged
Bristol West 89.7% of Bristol West
Dursley, Thornbury and Yate 81.9% of Thornbury and Yate 20.9% of Stroud
8.9% of Cotswolds, The
Filton and Bradley Stoke 100% of Filton and Bradley Stoke 9.2% of Thornbury and Yate
Kingswood 100% of Kingswood 8.9% of Thornbury and Yate
Somerset North Unchanged
Somerset North East 81.6% of Somerset North East 15.3% of Wells
6.9% of Somerton and Frome
Weston-super-Mare Unchanged


New seatPrimary componentSecondary component(s)
Cheltenham 94.1% of Cheltenham
Cotswolds, The 91.1% of Cotswolds, The 6.5% of Stroud
Gloucester 83.5% of Gloucester 9.3% of Tewkesbury
Gloucestershire West 100% of Forest of Dean 4.8% of Tewkesbury
Stroud 72.7% of Stroud 16.5% of Gloucester
Tewkesbury 85.9% of Tewkesbury 5.9% of Cheltenham


New seatPrimary componentSecondary component(s)
Banbury and Bicester 91.6% of Banbury
Henley and Thame 89.1% of Henley 8.4% of Banbury
7.0% of Wantage
Oxford East 100% of Oxford East 8.0% of Oxford West and Abingdon
Oxford West and Abingdon 90.9% of Oxford West and Abingdon 10.9% of Henley
0.9% of Wantage
Wantage 92.1% of Wantage 1.1% of Oxford West and Abingdon
Witney Unchanged


New seatPrimary componentSecondary component(s)
Chippenham 66.6% of Wiltshire North 45.2% of Chippenham
Devizes 86.7% of Devizes 25.5% of Wiltshire North
Salisbury 99.8% of Salisbury 11.6% of Devizes
2.0% of Wiltshire South West
Swindon North 95.2% of Swindon North 2.3% of Swindon South
Swindon South 97.7% of Swindon South 4.8% of Swindon North
Trowbridge 54.8% of Chippenham 39.4% of Wiltshire South West
7.9% of Wiltshire North
1.7% of Devizes
Warminster and Shaftesbury 58.7% of Wiltshire South West 49.3% of Dorset North
0.2% of Salisbury