Table 1 Overview of the MPs under study and their party affiliations
| Political party | N | Left or Right-wing |
|---|---|---|
| Conservative | 315 | Right |
| Labour | 252 | Left |
| Scottish National Party | 35 | Left |
| Independent | 11 | 10 Left, 1 Right |
| Liberal Democrat | 11 | Left |
| Democratic Unionist Party | 10 | Right |
| Plaid Cymru | 4 | Left |
| Green Party | 1 | Left |
| Total | 639 |