Notional results for a UK general election on 12 December 2019 South West, England - by party
A notional general election to the 58th Parliament of the United Kingdom with an electorate of 47,558,398, having 32,014,119 valid votes.
| Party | Constituencies contested | Votes | Vote share | Constituencies won |
| Conservative | 58 | 1,612,090 | 53.5% | 50 |
| Labour | 58 | 713,226 | 23.7% | 7 |
| Liberal Democrat | 56 | 554,504 | 18.4% | 1 |
| Green Party | 56 | 115,021 | 3.8% | 0 |
| The Brexit Party | 12 | 11,139 | 0.4% | 0 |
| Liberal | 7 | 4,225 | 0.1% | 0 |
| Mebyon Kernow - The Party for Cornwall | 3 | 1,661 | 0.1% | 0 |
| UK Independence Party | 2 | 1,227 | 0.0% | 0 |
| Libertarian Party | 1 | 567 | 0.0% | 0 |
| Animal Welfare Party | 1 | 489 | 0.0% | 0 |
| Official Monster Raving Loony Party | 1 | 445 | 0.0% | 0 |
| Motherworld Party | 1 | 270 | 0.0% | 0 |
| The Citizens Movement Party UK | 1 | 256 | 0.0% | 0 |
| The Constitution and Reform Party | 1 | 186 | 0.0% | 0 |
| The Common People | 1 | 132 | 0.0% | 0 |
Estimates of the 2019 general election result in new constituencies
BBC News, ITV News, Sky News and the Press Association have together produced estimates of the 2019 general election result as if the new constituencies recommended by the separate Parliamentary Boundary Commissions for England, Scotland, Wales and Northern Ireland had then been in existence.
Rallings & Thrasher, Professor David Denver (Scotland), Nicholas Whyte (NI) for Sky News, PA, BBC News and ITV News.
An explanation of the methods used and the electoral impact of the changes can be found in the linked document.