| Prime Minister
| Date | Party
|
| Sir Robert Walpole | 1721-42 | Whig
|
| Spencer Compton, 1st Earl of Wilmington | 1742-43 | Whig
|
| Henry Pelham | 1743-54 | Whig
|
| Thomas Pelham-Holles, 1st Duke of Newcastle | 1754-1756 | Whig
|
| William Cavendish, 4th Duke of Devonshire | 1756-57 | Whig
|
| Thomas Pelham-Holles, 1st Duke of Newcastle | 1757-62 | Whig
|
| John Stuart, 3rd Earl of Bute | 1762-63 | Tory
|
| George Grenville | 1763-65 | Whig
|
| Charles Watson-Wentworth, 2nd Marquess of Rockingham | 1765-66 | Whig
|
| William Pitt, 1st Earl of Chatham | 1766-67 | Whig
|
| Augustus Henry Fitzroy, 3rd Duke of Grafton | 1767-70 | Whig
|
| Frederick North, Lord North | 1770-82 | Tory
|
| Charles Watson-Wentworth, 2nd Marquess of Rockingham | 1782 | Whig
|
| William Petty, 2nd Earl of Shelburne | 1782-83 | Whig
|
| William Cavendish-Bentinck, 3rd Duke of Portland | 1783 | Whig
|
| William Pitt The Younger | 1783-1801 | Tory
|
| Henry Addington | 1801-04 | Tory
|
| William Pitt the Younger | 1804-1806 | Tory
|
| William Wyndham Grenville, 1st Lord Grenville | 1806-07 | Whig
|
| William Cavendish-Bentinck, 3rd Duke of Portland | 1807-09 | Tory
|
| Spencer Perceval | 1809-12 | Tory
|
| Robert Banks Jenkinson, 2nd Earl of Liverpool | 1812-27 | Tory
|
| George Canning | 1827 | Tory
|
| Frederick John Robinson, 1st Viscount Goderich | 1827-28 | Tory
|
| Arthur Wellesley, 1st Duke of Wellington | 1828-30 | Tory
|
| Charles Grey, 2nd Earl Grey | 1830-34 | Whig
|
| William Lamb, 2nd Viscount Melbourne | 1834 | Whig
|
| Sir Robert Peel | 1834-35 | Tory
|
| William Lamb, 2nd Viscount Melbourne | 1835-1841 | Whig
|
| Sir Robert Peel | 1841-1846 | Tory
|
| Lord John Russell, later 1st Earl Russell | 1846-1852 | Whig
|
| Edward Geoffrey Smith Stanley, 14th Earl of Derby | 1852 | Conservative
|
| George Hamilton Gordon, 4th Earl of Aberdeen | 1852-55 | Peelite
|
| Henry John Temple, 3rd Viscount Palmerston | 1855-58 | Liberal
|
| Edward Geoffrey Smith Stanley, 14th Earl of Derby | 1858-1859 | Conservative
|
| Henry John Temple, 3rd Viscount Palmerston | 1859-1865 | Liberal
|
| John Russell, 1st Earl Russell | 1865-66 | Liberal
|
| Edward Geoffrey Smith Stanley, 14th Earl of Derby | 1866-68 | Conservative
|
| Benjamin Disraeli | 1868 | Conservative
|
| William Ewart Gladstone | 1868-74 | Liberal
|
| Benjamin Disraeli, from 1876 1st Earl of Beaconsfield | 1874-1880 | Conservative
|
| William Ewart Gladstone | 1880-1885 | Liberal
|
| Robert Arthur Talbot Gascoyne-Cecil, 3rd Marquess of Salisbury | 1885-6 | Conservative
|
| William Ewart Gladstone | 1886 | Liberal
|
| Robert Arthur Talbot Gascoyne-Cecil, 3rd Marquess of Salisbury | 1886-1892 | Conservative
|
| William Ewart Gladstone | 1892-1894 | Liberal
|
| Archibald Philip Primrose, 5th Earl of Rosebery | 1894-95 | Liberal
|
| Robert Arthur Talbot Gascoyne-Cecil, 3rd Marquess of Salisbury | 1895-1902 | Conservative
|
| Arthur James Balfour | 1902-05 | Conservative
|
| Sir Henry Campbell-Bannerman | 1905-08 | Liberal
|
| Herbert Henry Asquith | 1908-16 | Liberal
|
| David Lloyd George | 1916-22 | Liberal
|
| Andrew Bonar Law | 1922-23 | Conservative
|
| Stanley Baldwin | 1923-1924 | Conservative
|
| Ramsay MacDonald | 1924 | Labour
|
| Stanley Baldwin | 1924-1929 | Conservative
|
| Ramsay MacDonald | 1929-1935 | Labour
|
| Stanley Baldwin | 1935-1937 | Conservative
|
| Neville Chamberlain | 1937-40 | Conservative
|
| Winston Churchill | 1940-45 | Conservative
|
| Clement Attlee | 1945-51 | Labour
|
| Sir Winston Churchill | 1951-1955 | Conservative
|
| Sir Anthony Eden | 1955-57 | Conservative
|
| Harold Macmillan | 1957-63 | Conservative
|
| Sir Alec Douglas-Home | 1963-1964 | Conservative
|
| Harold Wilson | 1964-1970 | Labour
|
| Edward Heath | 1970-1974 | Conservative
|
| Harold Wilson | 1974-1976 | Labour
|
| James Callaghan | 1976-1979 | Labour
|
| Margaret Thatcher | 1979-1990 | Conservative
|
| John Major | 1990-1997 | Conservative
|
| Tony Blair | 1997-2007 | Labour
|
| Gordon Brown | 2007-2010 | Labour
|
| David Cameron | 2010-2016 | Conservative
|
| Theresa May | 2016-2019 | Conservative
|
| Boris Johnson | 2019- | Conservative
|