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 | 32 | 29 | -3 | -3 | -4 | 3 | 1 |
| LAB | 42 | 39 | -3 | -5 | -2 | 4 | 0 |
| LIB | 1 | 0 | -1 | 0 | -1 | 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 | 75 | 68 | -7 | -8 | -7 | 7 | 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: Lancaster and Fleetwood; Liverpool Walton; Ribble Valley; Rochdale; Stockport; Tatton; Wirral South; Workington.
The old seats which are lost to another party are: Bolton North East; Burnley; Bury South; Heywood and Middleton; Oldham East and Saddleworth; Weaver Vale; Westmorland and Lonsdale.
The new seats which are gained from another party are: Bolton North East; Burnley; Prestwich and Middleton; Rochdale; Littleborough and Saddleworth; Weaver Vale; Westmorland and Lonsdale.
The new seats which are freshly created are: Bramhall and Wilmslow.
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Altrincham and Knutsford | 78.2% of Altrincham and Sale West | 26.2% of Tatton
9.7% of Stretford and Urmston
|
| Blackley and Broughton | Unchanged | |
| Manchester Central | 87.2% of Manchester Central | |
| Manchester Gorton | Unchanged | |
| Manchester Withington | Unchanged | |
| Salford and Eccles | Unchanged | |
| Stretford and Urmston | 90.3% of Stretford and Urmston | 21.8% of Altrincham and Sale West |
| Worsley and Eccles South | Unchanged | |
| Wythenshawe and Sale East | Unchanged |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Chester, City of | 99.2% of Chester, City of | 2.8% of Ellesmere Port and Neston
2.5% of Eddisbury
|
| Congleton | 100% of Congleton | 0.3% of Eddisbury |
| Crewe and Nantwich | 100% of Crewe and Nantwich | 5.7% of Eddisbury |
| Eddisbury | 81.6% of Eddisbury | 14.7% of Weaver Vale
11.1% of Tatton
0.3% of Chester, City of
|
| Ellesmere Port and Neston | 92.2% of Ellesmere Port and Neston | 19.4% of Wirral South
0.5% of Chester, City of
|
| Macclesfield | 100% of Macclesfield | 5.0% of Tatton |
| Warrington North | 100% of Warrington North | 7.4% of Warrington South |
| Warrington South | 92.6% of Warrington South | |
| Weaver Vale | 78.5% of Weaver Vale | 15.0% of Tatton
10.0% of Eddisbury
5.1% of Ellesmere Port and Neston
|
| Widnes and Runcorn | 100% of Halton | 6.7% of Weaver Vale |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Barrow and Furness | 99.7% of Barrow and Furness | 11.0% of Copeland |
| Carlisle | 100% of Carlisle | 26.0% of Penrith and The Border |
| Cumbria West | 76.2% of Copeland | 54.7% of Workington |
| Penrith and Solway | 60.7% of Penrith and The Border | 45.3% of Workington
12.8% of Copeland
|
| Westmorland and Lonsdale | 100% of Westmorland and Lonsdale | 13.2% of Penrith and The Border
0.3% of Barrow and Furness
|
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Ashton-under-Lyne and Stalybridge | 49.8% of Stalybridge and Hyde | 50.6% of Ashton under Lyne
14.2% of Denton and Reddish
|
| Bramhall and Wilmslow | 41.8% of Cheadle | 42.7% of Tatton
17.3% of Hazel Grove
16.9% of Stockport
|
| Littleborough and Saddleworth | 56.9% of Oldham East and Saddleworth | 50.1% of Rochdale |
| Marple and Hyde | 66.2% of Hazel Grove | 50.2% of Stalybridge and Hyde |
| Oldham North | 67.9% of Oldham West and Royton | 22.4% of Oldham East and Saddleworth
12.8% of Manchester Central
|
| Oldham South and Droylsden | 49.4% of Ashton under Lyne | 32.1% of Oldham West and Royton
20.7% of Oldham East and Saddleworth
14.3% of Denton and Reddish
|
| Rochdale | 49.5% of Heywood and Middleton | 49.9% of Rochdale |
| Stockport East and Denton | 71.5% of Denton and Reddish | 32.3% of Stockport
16.5% of Hazel Grove
|
| Stockport West and Cheadle | 58.2% of Cheadle | 50.8% of Stockport |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Blackburn | 100% of Blackburn | 5.8% of Rossendale and Darwen |
| Blackpool North and Fleetwood | 69.4% of Blackpool North and Cleveleys | 29.9% of Lancaster and Fleetwood
20.6% of Wyre and Preston North
|
| Blackpool South | 100% of Blackpool South | 30.6% of Blackpool North and Cleveleys |
| Burnley | 78.9% of Burnley | 40.9% of Pendle |
| Chorley | 100% of Chorley | 6.8% of Ribble South |
| Fylde | 100% of Fylde | 11.9% of Wyre and Preston North |
| Hyndburn | 87.7% of Hyndburn | 21.1% of Burnley |
| Lancashire North | 36.5% of Wyre and Preston North | 28.9% of Lancaster and Fleetwood
20.8% of Ribble Valley
20.7% of Morecambe and Lunesdale
0.3% of Preston
|
| Lancashire West | 100% of Lancashire West | 2.3% of Ribble South |
| Lancaster and Morecambe | 79.3% of Morecambe and Lunesdale | 41.2% of Lancaster and Fleetwood |
| Pendle and Ribble Valley | 59.1% of Pendle | 48.5% of Ribble Valley |
| Preston | 99.7% of Preston | 31.0% of Wyre and Preston North |
| Ribble South | 76.1% of Ribble South | 30.7% of Ribble Valley |
| Rossendale and Darwen | 94.2% of Rossendale and Darwen | 12.3% of Hyndburn |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Birkenhead | 100% of Birkenhead | 19.9% of Wirral South |
| Bootle | 85.0% of Bootle | 33.1% of Liverpool Walton |
| Garston and Halewood | Unchanged | |
| Knowsley | Unchanged | |
| Liverpool Riverside | 88.1% of Liverpool Riverside | 31.0% of Liverpool Walton |
| Liverpool Wavertree | 100% of Liverpool Wavertree | 15.6% of Liverpool West Derby
11.9% of Liverpool Riverside
|
| Liverpool West Derby | 84.4% of Liverpool West Derby | 35.8% of Liverpool Walton |
| Sefton Central | 100% of Sefton Central | 15.0% of Bootle |
| Southport | 100% of Southport | 14.8% of Ribble South |
| St Helens North | Unchanged | |
| St Helens South and Whiston | Unchanged | |
| Wallasey | 100% of Wallasey | 22.3% of Wirral West |
| Wirral West and Bebington | 77.7% of Wirral West | 60.6% of Wirral South |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Bolton North East | 87.4% of Bolton North East | 27.1% of Bolton South East |
| Bolton West | 100% of Bolton West | 12.6% of Bolton North East |
| Bury | 100% of Bury North | 10.0% of Bury South |
| Farnworth and Radcliffe | 72.9% of Bolton South East | 34.6% of Bury South |
| Leigh | Unchanged | |
| Makerfield | Unchanged | |
| Prestwich and Middleton | 55.4% of Bury South | 50.5% of Heywood and Middleton |
| Wigan | Unchanged |