| partial answer | answer |
| 2010 | |
| 2005 | |
| 2001 | |
| 1997 | |
| 1992 | |
| 1987 | |
| 1983 | |
| 1979 | |
| 1974 | |
| 1974 | |
| 1970 | |
| 1966 | |
| 1964 | |
| 1959 | |
| 1955 | |
| 1951 | |
| 1950 | |
| 1945 | |
| 1935 | |
| 1931 | |
| 1929 | |
| 1924 | |
| 1923 | |
| 1922 | |
| 1918 | |
| 1910 | |
| 1910 | |
| 1906 | |
| 1900 | |
| | partial answer | answer |
| Asquith | |
| Asquith | |
| Attlee | |
| Attlee | |
| Baldwin | |
| Baldwin | |
| Blair | |
| Blair | |
| Blair | |
| Cameron | |
| Campbell-Bannerman | |
| Churchill | |
| Eden | |
| Heath | |
| Law | |
| Lloyd George | |
| MacDonald | |
| MacDonald | |
| MacDonald | |
| Macmillan | |
| Major | |
| Salisbury | |
| Thatcher | |
| Thatcher | |
| Thatcher | |
| Wilson | |
| Wilson | |
| Wilson | |
| Wilson | |
|