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 2019 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.
| Party | Old Seats | New Seats | Change | Disappear | Switch Out | Switch In | Fresh |
|---|---|---|---|---|---|---|---|
| CON | 26 | 26 | 0 | -3 | -1 | 3 | 1 |
| LAB | 28 | 24 | -4 | -2 | -3 | 1 | 0 |
| LIB | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Brexit | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Green | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| MIN | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Total | 54 | 50 | -4 | -5 | -4 | 4 | 1 |
The table shows how the various changes affect each party in this area. 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:
The old seats which are disappearing are: Bradford East; Great Grimsby; Haltemprice and Howden; Leeds West; Penistone and Stocksbridge.
The old seats which are lost to another party are: Batley and Spen; Hemsworth; Hull West and Hessle; Pudsey.
The new seats which are gained from another party are: Bradford South East and Spen; Wakefield Rural; Kingston upon Hull West and Haltemprice; Pudsey.
The new seats which are freshly created are: Great Grimsby North and Barton.
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Beverley and Holderness | Unchanged | |
| Cleethorpes and Great Grimsby South | 55.6% of Cleethorpes | 55.1% of Great Grimsby |
| Goole, Howden and Axholme | 60.8% of Brigg and Goole | 53.5% of Haltemprice and Howden |
| Great Grimsby North and Barton | 44.4% of Cleethorpes | 44.9% of Great Grimsby
21.4% of Brigg and Goole
|
| Kingston upon Hull East | 100% of Hull East | 14.2% of Hull West and Hessle |
| Kingston upon Hull North | 100% of Hull North | 15.0% of Hull West and Hessle |
| Kingston upon Hull West and Haltemprice | 70.8% of Hull West and Hessle | 46.5% of Haltemprice and Howden |
| Scunthorpe | 100% of Scunthorpe | 17.9% of Brigg and Goole |
| Yorkshire East | Unchanged |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Harrogate and Knaresborough | Unchanged | |
| Richmond | 99.7% of Richmond | 0.7% of Thirsk and Malton |
| Scarborough and Whitby | 100% of Scarborough and Whitby | 3.5% of Thirsk and Malton |
| Selby and Ainsty | Unchanged | |
| Skipton and Ripon | Unchanged | |
| Thirsk and Malton | 95.7% of Thirsk and Malton | 0.3% of Richmond |
| York Central | 98.8% of York Central | 5.4% of York Outer |
| York Outer | 94.6% of York Outer | 1.2% of York Central |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Barnsley East and Hemsworth | 50.4% of Barnsley East | 37.9% of Barnsley Central
16.2% of Hemsworth
10.2% of Wentworth and Dearne
|
| Barnsley West and Stocksbridge | 62.1% of Barnsley Central | 45.5% of Penistone and Stocksbridge
10.7% of Barnsley East
|
| Don Valley | 87.9% of Don Valley | 15.9% of Doncaster North
2.5% of Doncaster Central
|
| Doncaster Central | 97.5% of Doncaster Central | 6.5% of Doncaster North |
| Doncaster North | 77.6% of Doncaster North | 12.1% of Don Valley
11.4% of Wentworth and Dearne
|
| Rother Valley | Unchanged | |
| Rotherham | 100% of Rotherham | 12.6% of Wentworth and Dearne |
| Sheffield Central | 72.3% of Sheffield Central | 20.2% of Sheffield Brightside and Hillsborough
13.9% of Sheffield Hallam
|
| Sheffield Hallam | 86.1% of Sheffield Hallam | 20.5% of Sheffield Heeley |
| Sheffield North and Ecclesfield | 71.8% of Sheffield Brightside and Hillsborough | 41.1% of Penistone and Stocksbridge |
| Sheffield South | 79.5% of Sheffield Heeley | 27.7% of Sheffield Central |
| Sheffield South East | 100% of Sheffield South East | 8.0% of Sheffield Brightside and Hillsborough |
| Wentworth and Hoyland | 65.8% of Wentworth and Dearne | 38.9% of Barnsley East |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Batley and Morley | 68.2% of Morley and Outwood | 32.6% of Batley and Spen |
| Bradford North | 68.3% of Bradford West | 51.5% of Bradford East |
| Bradford South | 49.5% of Bradford South | 31.7% of Bradford East
31.7% of Bradford West
|
| Bradford South East and Spen | 67.4% of Batley and Spen | 31.9% of Bradford South |
| Calderdale South and Queensbury | 66.3% of Calder Valley | 25.1% of Halifax
18.6% of Bradford South
|
| Colne Valley and Penistone | 82.2% of Colne Valley | 13.4% of Penistone and Stocksbridge |
| Dewsbury | 100% of Dewsbury | 0.1% of Colne Valley
0.1% of Huddersfield
|
| Elmet and Rothwell | Unchanged | |
| Halifax and North Calderdale | 74.9% of Halifax | 33.7% of Calder Valley |
| Huddersfield | 99.9% of Huddersfield | 17.7% of Colne Valley |
| Keighley | 100% of Keighley | 13.3% of Shipley |
| Leeds Central | 81.6% of Leeds Central | 27.4% of Leeds West |
| Leeds East | 100% of Leeds East | 18.4% of Leeds Central |
| Leeds North East | 100% of Leeds North East | 16.1% of Leeds North West |
| Leeds North West | 83.9% of Leeds North West | 24.3% of Pudsey
22.5% of Leeds West
|
| Normanton, Pontefract and Castleford | Unchanged | |
| Pudsey | 49.8% of Pudsey | 50.1% of Leeds West
16.8% of Bradford East
|
| Shipley | 86.7% of Shipley | 25.9% of Pudsey |
| Wakefield | 80.3% of Wakefield | 31.8% of Morley and Outwood |
| Wakefield Rural | 83.8% of Hemsworth | 19.7% of Wakefield |