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) |
|---|---|---|
| Blackburn | 100% of Blackburn | 5.9% of Rossendale and Darwen |
| Blackpool North and Fleetwood | 75.3% of Blackpool North and Cleveleys | 28.8% of Lancaster and Fleetwood
15.6% of Wyre and Preston North
|
| Blackpool South | 100% of Blackpool South | 24.7% of Blackpool North and Cleveleys |
| Burnley and Accrington East | 86.6% of Burnley | 29.3% of Hyndburn |
| Chorley | 100% of Chorley | 11.0% of Ribble South |
| Fylde | 100% of Fylde | 16.5% of Wyre and Preston North |
| Lancashire West | Unchanged | |
| Lancaster and Wyre | 65.8% of Lancaster and Fleetwood | 44.0% of Wyre and Preston North
0.3% of Preston
|
| Morecambe and Lunesdale | 100% of Morecambe and Lunesdale | 5.4% of Lancaster and Fleetwood |
| Pendle | 100% of Pendle | 13.4% of Burnley |
| Preston | 99.7% of Preston | 24.0% of Wyre and Preston North |
| Ribble South | 89.0% of Ribble South | 14.9% of Ribble Valley |
| Ribble Valley | 85.1% of Ribble Valley | 19.4% of Hyndburn |
| Rossendale and Oswaldtwistle | 59.6% of Rossendale and Darwen | 51.3% of Hyndburn |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Birkenhead | 100% of Birkenhead | 21.0% of Wirral South |
| Bootle and North Liverpool | 73.0% of Bootle | 36.1% of Liverpool Walton |
| Crosby and Maghull | 85.6% of Sefton Central | 27.0% of Bootle |
| Garston and Halewood | 70.3% of Garston and Halewood | 41.0% of Liverpool Riverside |
| Knowsley | Unchanged | |
| Liverpool Riverside and Walton | 59.0% of Liverpool Riverside | 46.0% of Liverpool Walton
13.7% of Liverpool Wavertree
|
| Liverpool Wavertree | 86.3% of Liverpool Wavertree | 29.7% of Garston and Halewood |
| Liverpool West Derby | 100% of Liverpool West Derby | 17.9% of Liverpool Walton |
| Southport | 100% of Southport | 14.4% of Sefton Central |
| St Helens North | Unchanged | |
| St Helens South and Whiston | Unchanged | |
| Wallasey | 100% of Wallasey | 22.1% of Wirral West |
| Wirral Deeside | 77.9% of Wirral West | 40.3% of Wirral South
17.4% of Ellesmere Port and Neston
|