| Changes in British Elections | ||||
| Election | Governing Party | Majority | Majority Gain/Loss | |
| 1945 | Labour | 146 | ||
| 1950 | Labour | 5 | -141 | |
| 1951 | Conservative | 17 | ||
| 1955 | Conservative | 59 | 42 | |
| 1959 | Conservative | 100 | 41 | |
| 1964 | Labour | 5 | ||
| 1966 | Labour | 97 | 92 | |
| 1970 | Conservative | 31 | ||
| 1974 | Labour | -32 | ||
| 1974 | Labour | 4 | 36 | |
| 1979 | Conservative | 44 | ||
| 1983 | Conservative | 144 | 100 | |
| 1987 | Conservative | 100 | -44 | |
| 1992 | Conservative | 21 | -79 | |
| 1997 | Labour | 178 | ||
| 2001 | Labour | 166 | -12 | |
| 2005 | Labour | 71 | -95 | |
| Majority is defined as the seats held by the largest party minus the seats held by all other parties | ||||