PRIME MINISTERS          
No. NAME DATES OF BIRTH AND DEATH POLITICAL PARTIES IN GOVERNMENT DATE OF APPOINTMENT DATE OF LEAVING OFFICE REASON FOR LEAVING OFFICE
1 ROBERT WALPOLE  [SIR Robert Walpole from 1725] (b26Aug1676, d18Mar1745) Whig  3 Apr 1721  8 Feb 1742 Defeat in House of Commons
2 Sir Spencer Compton,   EARL OF WILMINGTON (b1673/4, d 2Jul1743) Whig 16 Feb 1742  2 July 1743 Died
3 HENRY PELHAM (b c 1695, d 6Mar1754) Whig 27 Aug 1743  6 Mar 1754 Died
  [Note: Pelham and his colleagues having tendered their resignations, the Earl of Bath was on 10 Feb 1746 appointed First Lord of the Treasury and asked to form a government. He was unable to do so and resigned on 12 Feb 1746 whereupon the Pelham government resumed office]
4(1) Sir Thomas Pelham-Holles, Bt, 1st DUKE OF NEWCASTLE-upon-Tyne   (b21Jul1693, d17Nov1768) Whig  16 Mar 1754 26 Oct 1756 Criticism of conduct of war 
5 Sir William Cavendish,  4th DUKE OF DEVONSHIRE (b1720, d2Oct1764) Alternative Whig 16 Nov 1756   May 1757 Policy disagreement with the king
  [Note: The Earl of Waldegrave was asked to form a government on 8 Jun 1757, but was unable to do so and and resigned his commission on 12 Jun 1757]
4(2) Sir Thomas Pelham-Holles, Bt, 1st DUKE OF NEWCASTLE-upon-Tyne   (b21Jul1693, d17Nov1768) Whig Coalition  2 Jul 1757 25 May 1762 Cabinet disagreements
6 John Stuart, 3rd EARL OF BUTE (b25May1713, d10Mar1792) Bute party and others 26 May 1762  8 Apr 1763 General unpopularity
7 GEORGE GRENVILLE (b14Oct1712, d13Nov1770) Grenville,Bedford and Bute parties 16 Apr 1763 10 Jul 1765 Dismissed by the king
8(1) Sir Charles Watson-Wentworth,  2nd MARQUESS OF ROCKINGHAM (b13May1730, d1Jul1782) (True or Old) Whig 13 Jul 1765  Jul 1766 Dismissed by the king
9 William Pitt, 1st EARL OF CHATHAM (b15Nov1708, d11May1788) Chathamite & others 30 July 1766 14 Oct 1768 Cabinet disagreements
  [Note: Chatham took office as Lord Privy Seal, not First Lord of the Treasury to which office he appointed the Duke of Grafton. Chatham fell ill in December 1766 and from March 1767 Grafton was effectively head of the government, though it was always understood that this was only until Chatham recovered. In October 1768 Chatham resigned because he disapproved of the decision to dismiss the Earl of Shelburne from office, and Grafton as First Lord of the Treasury automatically became head of the ministry]
10 Augustus Henry Fitzroy, 3rd DUKE OF GRAFTON (b28Sep1735, d14Mar1811) Chathamite & others 14 Oct 1768 28 Jan 1770 Cabinet disagreements
11 Sir Frederick North, LORD NORTH (b13Apr1732, d5Aug1792) Northite (see note2) 28 Jan 1770 20 Mar 1782 Loss of Majority in House of Commons
8(2) Sir Charles Watson-Wentworth,  2nd MARQUESS OF ROCKINGHAM (b13May1730, d1Jul1782) Whig 27 Mar 1782  1 Jul 1782 Died
12 Sir William Petty, 2nd EARL OF SHELBURNE (b20May1737, d7May1805) Chathamite  4 Jul 1782 24 Feb 1783 Defeat in House of Commons
13(1) William Henry Cavendish Bentinck,  3rd DUKE OF PORTLAND (b14Apr1738, d30Oct1809) COALITION:  (Foxite) Whigs, Northites  2 Apr 1783 ? Dec 1783 Dismissed by the king
14(1) WILLIAM PITT (b28May1759, d23Jan1806) Pitt Coalition 19 Dec 1783 14 Mar 1801 Policy disagreement with the king
15 HENRY ADDINGTON (b30May1757, d15Feb1844) Addington party 17 Mar 1801 30 Apr 1804 Criticism of conduct of war 
14(2) WILLIAM PITT (b28May1759, d23Jan1806) Pitt's Friends 10 May 1804 23 Jan 1806 Died
16 William Wyndmam Grenville,  1st BARON GRENVILLE (b25Oct1759, d12Jan1834) COALITION: (Foxite) Whigs, Grenville party, Sidmouth (or Addington) party 10 Feb 1806 25 Mar 1807 Policy disagreement with the king
13(2) Sir William Henry Cavendish-Bentinck, 3rd DUKE OF PORTLAND (b14Apr1738, d30Oct1809) Pitt's Friends 31 Mar 1807  Oct 1809 Cabinet disagreements
17 SPENCER PERCEVAL (b1Nov1762, d11May1812) Tory  4 Oct 1809 11 May 1812 Died (murdered)
18 Robert Banks Jenkinson, 2nd EARL OF LIVERPOOL (b7Jun1770, d4 Dec1828) Tory  8 Jun 1812 17 Feb 1827 Retired (due to illness) 
19 GEORGE CANNING (b11Apr1770,d8Aug1827) Canningite 10 Apr 1827  8 Aug 1827 Died
20 Frederick John Robinson, VISCOUNT GODERICH (b1Nov1782, d28Jan1859) Canningite 31 Aug 1827  8 Jan 1828 Cabinet disagreements
21 Sir Arthur Wellesley, 1st DUKE OF WELLINGTON (b1May1769, d14Sep1852) Tory 22 Jan 1828 21 Nov 1830 Defeat in House of Commons
22 Sir Charles Grey, Bt, 2nd EARL GREY (b13Mar1764,d17Jul1845) Whig 22 Nov 1830  9 Jul 1834 Retired
  [Note: following the rejection of the Reform Bill on 7 May 1832 the king decided to ascertain whether the Tories could form a government and asked the Grey administration to remain in office till its successors were appointed. Though the government's resignation was announced, it proved impossible to form a Tory government due to the refusal of Sir Robert Peel to join, and the goverment's resignation was withdrawn on 17 May 1832]
23(1) Sir William Lamb, Bt, 3rd VISCOUNT MELBOURNE (b15Mar1779, d24Nov1848) Whig 16 Jul 1834 14 Nov 1834 Dismissed by the king
  [Note: following the dismissal of Viscount Melbourne, and pending the return of Sir Robert Peel from holiday in Italy, the DUKE OF WELLINGTON took office on 17 Nov 1834 as First Lord of the Treasury and sole Secretary of State. He refused the office of Prime Minister and did not appoint a cabinet. He ceased to be First Lord of the Teasury when Peel took office on 10 Dec 1834 but remained Secretary of State for Foreign Affairs]
24(1) SIR ROBERT PEEL, Bt (b5Feb1788, d2Jul1850) Tory or Conservative 10 Dec 1834  8 Apr 1835 Defeat in House of Commons
23(2) Sir William Lamb, Bt, 3rd VISCOUNT MELBOURNE (b15Mar1779, d24Nov1848) Whig 18 Apr 1835 30 Aug 1841 Defeat in House of Commons
  [Note: following defeat in the House of Commons, Melbourne tendered his resignation on 7 May 1839. However,though the queen asked the Conservative leader, Sir Robert Peel, to form a government, she refused to accept certain appointments in her household ("The Bedchamber Crisis"). Peel therefore refused to take office and Melbourne's resignation was withdrawn on 10 May 1839]
24(2) SIR ROBERT PEEL, Bt (b5Feb1788, d2Jul1850) Conservative 30 Aug 1841 27 Jun 1846 Defeat in House of Commons
  [Note: due to internal Cabinet disagreements, Peel offered his resignation on 6 Dec 1845. However, the Whig leader Lord John Russell was unable to form a government and Peel resumed authority on 20 Dec 1845]
25(1) LORD JOHN RUSSELL (b18Aug1792, d28May1878) Whig 30 Jun 1846 21 Feb 1852 Defeat in House of Commons
  [Note: following defeat in the House of Commons, Russell tendered his resignation on 22 Feb 1851. However, the Conservatives refused to take office and Russell withdrew his resignation on 5 Mar 1851]
26(1) Sir Edward Geoffrey Smith-Stanley,  14th EARL OF DERBY (b19Mar1799, d23Oct1869) Conservative 23 Feb 1852  17 Dec 1852 Defeat in House of Commons
27 Sir George Hamilton Gordon,  4th EARL OF ABERDEEN (b28Jan1784, d14Dec1860) COALITION: Whig, Peelite, Radical 19 Dec 1852 30 Jan 1855 Defeat in House of Commons
28(1) Sir Henry John Temple,   3rd VISCOUNT PALMERSTON (b20Oct1784, d18Oct1865) Palmerstonian (see note3)  6 Feb 1855 21 Feb 1858 Defeat in House of Commons
26(2) Sir Edward Geoffrey Smith-Stanley,  14th EARL OF DERBY (b19Mar1799, d23Oct1869) Conservative 21 Feb 1858 11 Jun 1859 Defeat in House of Commons
28(2) Sir Henry John Temple,   3rd VISCOUNT PALMERSTON (b20Oct1784, d18Oct1865) Liberal 12 Jun 1859 18 Oct 1865 Died
25(2) Lord John Russell, 1st EARL RUSSELL (b18Aug1792, d28May1878) Liberal 29 Oct 1865 26 Jun 1866 Defeat in House of Commons
26(3) Sir Edward Geoffrey Smith-Stanley,  14th EARL OF DERBY (b19Mar1799, d23Oct1869) Conservative 28 Jun 1866 25 Feb 1868 Retired
29(1) BENJAMIN DISRAELI (b21Dec1804, d19Apr 1881) Conservative 27 Feb 1868  1 Dec 1868 Defeated at General Election
30(1) WILLIAM Ewart GLADSTONE (b29Dec1809, d19May1898)  Liberal  3 Dec 1868 17 Feb 1874 Defeated at General Election
  [Note: following defeat in the House of Commons, Gladstone tendered his resignation on 13 Mar 1873. However, the Conservative leader, Benjamin Disraeli, refused to take office and Gladstone withdrew his resignation on 19 Mar 1873]
29(2) BENJAMIN DISRAELI [EARL OF BEACONSFIELD from 12 Aug 1876] (b21Dec1804, d19Apr 1881) Conservative 20 Feb 1874 21 Apr 1880 Defeated at General Election
30(2) WILLIAM Ewart GLADSTONE (b29Dec1809, d19May1898)  Liberal 23 Apr 1880  9 Jun 1885 Defeat in House of Commons
31(1) Robert Arthur Talbot Gascoyne-Cecil,  3rd MARQUESS OF SALISBURY (b 3Feb1830, d22Aug1903) Conservative 23 Jun 1885 28 Jan 1886 Defeat in House of Commons
30(3) WILLIAM Ewart GLADSTONE (b29Dec1809, d19May1898)  Liberal  1 Feb 1886 20 Jul 1886 Defeated at General Election
31(2) Robert Arthur Talbot Gascoyne-Cecil,  3rd MARQUESS OF SALISBURY (b 3Feb1830, d22Aug1903) Conservative 25 Jul 1886 11 Aug 1892 Defeat in House of Commons
30(4) WILLIAM Ewart GLADSTONE (b29Dec1809, d19May1898)  Liberal 15 Aug 1892  3 Mar 1894 Retired
32 Sir Archibald Philip Primrose, 5th EARLOF ROSEBERY (b 7May1847, d21May1929) Liberal  5 Mar 1894 21 Jun 1895 Defeat in House of Commons
31(3) Robert Arthur Talbot Gascoyne-Cecil,  3rd MARQUESS OF SALISBURY (b 3Feb1830, d22Aug1903) Conservative (see note 4) 25 Jun 1895 11 Jul 1902 Retired
33 ARTHUR James BALFOUR (b25Jul1848, d19Mar1930) Conservative (see note 4) 12 Jul 1902  4 Dec 1905 Cabinet disagreements
34 SIR HENRY CAMPBELL-BANNERMAN (b 5Dec1836, d22Apr1908) Liberal  5 Dec 1905  5 Apr 1908 Retired (due to illness) 
35(1) Herbert HENRY ASQUITH (b12Sep1852, d15Feb1928) Liberal  5 Apr 1908 25 May 1915 Criticism of conduct of war 
35(2) Herbert HENRY ASQUITH (b12Sep1852, d15Feb1928) COALITION: All main parties 25 May 1915  5 Dec 1916 Cabinet disagreements
36 David LLOYD GEORGE (b17Jan1863, d26Mar1945) COALITION: Conservative, Coalition Liberal, Labour till 10 Jan 1919  7 Dec 1916 19 Oct 1922 End of Coalition
37 Andrew BONAR LAW (b16Sep1858, d 30Oct1923) Conservative 23 Oct 1922 20 May 1923 Retired
38(1) STANLEY BALDWIN (b 3Aug 1868, d14Dec1947) Conservative 22 May 1923 22 Jan 1924 Defeat in House of Commons
39(1) James RAMSAY MACDONALD (b12Oct1866, d7Jun1935) Labour 22 Jan 1924  4 Nov 1924 Defeated at General Election
38(2) STANLEY BALDWIN (b 3Aug 1868, d14Dec1947) Conservative  4 Nov 1924  4 Jun 1929 Loss of Majority at General Election
39(2) James RAMSAY MACDONALD (b12Oct1866,  d7Jun1935) Labour  5 Jun 1929 24 Aug 1931 Cabinet disagreements
39(3) James RAMSAY MACDONALD (b12Oct1866, d7Jun1935) National Coalition: Conservative, Liberal till 28 Sep 1932, Liberal National, National Labour 24 Aug 1931  7 Jun 1935 Retired
38(3) STANLEY BALDWIN (b 3Aug 1868, d14Dec1947) Conservative (see note 5)  7 Jun 1935 28 May 1937 Retired
40 Arthur NEVILLE CHAMBERLAIN (b18Mar1869, d9Nov1940) Conservative (see note 5) 28 May 1937 10 May 1940 Criticism of conduct of war 
41(1) WINSTON Leonard Spencer-CHURCHILL (b30Nov1874, d24Jan1965) COALITION: All main parties 10 May 1940 23 May 1945 End of Coalition
41(2) WINSTON Leonard Spencer-CHURCHILL (b30Nov1874,d24Jan1965) Conservative (see note 5) 23 May 1945 26 Jul 1945 Defeated at General Election
42 CLEMENT Richard ATTLEE (b3Jan1883, d 8Oct1967) Labour 26 Jul 1945 26 Oct 1951 Defeated at General Election
41(3) WINSTON Leonard Spencer-CHURCHILL [SIR Winston Churchill from 24Apr1953] (b30Nov1874, d24Jan1965) Conservative 26 Oct 1951  5 Apr 1955 Retired
43 SIR Robert ANTHONY EDEN (b12Jun1897, d14Jan1977) Conservative  6 Apr 1955  9 Jan 1957 Retired (due to illness) 
44 Maurice HAROLD MACMILLAN (b10Feb1894, d29Dec1986) Conservative 10 Jan 1957 18 Oct 1963   Retired (due to illness) 
45 SIR Alexander(ALEC) Frederick DOUGLAS-HOME [Earl of Home till 23 Oct 1963] (b2Jul1903, d9Oct1995) Conservative 19 Oct 1963   16 Oct 1964 Defeated at General Election
46(1) James HAROLD WILSON (b11Mar1916, d24May1995) Labour 16 Oct 1964 19 Jun 1970 Defeated at General Election
47 EDWARD Richard George HEATH (b9Jul1916, d17Jul2005) Conservative 19 Jun 1970  4 Mar 1974 Loss of Majority at General Election
46(2) James HAROLD WILSON (b11Mar1916, d24May1995) Labour  4 Mar 1974  5 Apr 1976 Retired
48 Leonard JAMES CALLAGHAN (b27Mar1912, d26Mar2005) Labour  5 Apr 1976  4 May 1979 Defeated at General Election
49 MARGARET Hilda THATCHER (b13Oct1925, d 8Apr2013) Conservative  4 May 1979 28 Nov 1990 Replaced as party leader
50 JOHN MAJOR (b29Mar1943         ) Conservative 28 Nov 1990  2 May 1997 Defeated at General Election
51 Anthony(TONY) Charles Lynton BLAIR (b6May1953        ) Labour  2 May 1997  27 Jun 2007 Retired
52 James GORDON BROWN (b20Feb1951       ) Labour  27Jun 2007  11 May 2010 Loss of Majority at General Election
53(1) DAVID William Duncan CAMERON (b9Oct1966         ) COALITION: Conservative, Liberal Democrat  11 May 2010  8 May 2015 End of Coalition
53(2) DAVID William Duncan CAMERON (b9Oct1966         ) Conservative  8 May 2015  13 Jul 2016 Lost Referendum on whether to remain in the European Union
54 THERESA Mary MAY (b1Oct1956         ) Conservative  13 Jul 2016    
Notes on party designations:
(1) All prime ministers in the eighteenth century called themselves Whigs. This had little meaning in terms of party loyalties. The party led by Rockingham and later Fox regarded itself as the only true whig party since it was a continuation of the party led by Newcastle and was the only party to have a continuous existence throughout George III's reign (1760-1820)
(2) North is often inaccurately described as a Tory although he started his career as a member of Newcastle's government and ended it allied to Fox. Pitt who was always opposed to North is also often called a Tory despite calling himself a whig. The Tory party of the eighteenth century disintegrated in the early 1760's and the Tory party of the nineteenth century did not emerge till after Pitt's death in 1806.
(3) The first Palmerston government is sometimes called Whig though the Whig Party was breaking up and the erstwhile Whig leader played a major part in the government's downfall. It has also been called Liberal but no parliamentary Liberal party had yet been formed and it was defeated in the parliaments of both 1852-57 and 1857-59, both of which had "liberal" majorities.
(4) The governments of 1895-1905 included the Liberal Unionist party which did not formally join the Conservative party till 1911
(5) The MacDonald government of 1931-35 was effectively dominated by the Conservative party after September 1932. The name "National" continued to be used by the governments of 1935-40 and the Churchill caretaker government of May-July 1945 on the grounds that they included some Liberal National and other members who were not officially Conservatives. 
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