Each new seat can be described as a combination of parts of old seats. These table show this decomposition. The winner of the old seat at the 2010 election is shown by party colour, as is the implied winner of the new seat.
The implied results are now calculated using the local election results for the wards which make up each old seat. This should be more accurate than the earlier implied results which assumed each constituency was homogeneous.
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Bath | 100% of Bath | 11.7% of Somerset North East |
| Bristol East | 100% of Bristol East | 10.1% of Bristol West |
| Bristol North West | Unchanged | |
| Bristol South | Unchanged | |
| Bristol West | 89.9% of Bristol West | |
| Gloucestershire South East | 71.9% of Thornbury and Yate | 20.3% of Filton and Bradley Stoke
18.6% of Kingswood
|
| Gloucestershire South West | 79.7% of Filton and Bradley Stoke | 28.1% of Thornbury and Yate |
| Kingswood and Keynsham | 81.4% of Kingswood | 28.9% of Somerset North East |
| Somerset North | Unchanged | |
| Wells and Somerset North East | 59.4% of Somerset North East | 31.2% of Wells
9.1% of Somerton and Frome
|
| Weston-Super-Mare | Unchanged |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Cheltenham | Unchanged | |
| Cotswolds, The | Unchanged | |
| Gloucester | 98.1% of Gloucester | |
| Gloucestershire West | 100% of Forest of Dean | 4.0% of Tewkesbury
1.9% of Gloucester
|
| Stroud | Unchanged | |
| Tewkesbury | 96.0% of Tewkesbury |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Banbury | 94.7% of Banbury | |
| Didcot and Wantage | 100% of Wantage | |
| Henley and Thame | 100% of Henley | 5.3% of Banbury
2.5% of Oxford West and Abingdon
|
| Oxford East | 95.3% of Oxford East | |
| Oxford West and Abingdon | 97.5% of Oxford West and Abingdon | 4.7% of Oxford East |
| Witney | Unchanged |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Devizes | 87.6% of Devizes | 25.3% of Wiltshire North |
| Salisbury | 99.8% of Salisbury | 10.6% of Devizes
2.1% of Wiltshire South West
|
| Swindon North | Unchanged | |
| Swindon South | Unchanged | |
| Warminster and Shaftesbury | 59.6% of Wiltshire South West | 40.3% of Dorset North
0.2% of Salisbury
|
| Wiltshire North | 72.3% of Wiltshire North | 36.4% of Chippenham |
| Wiltshire West | 63.6% of Chippenham | 38.2% of Wiltshire South West
2.4% of Wiltshire North
1.8% of Devizes
|