Name changed to United Kingdom of Great Britain and Northern Ireland in 1927
- Prime Ministers
Spencer Compton, 1st Earl of Wilmington
1742–1743
Thomas Pelham-Holles, 1st Duke of Newcastle
1754–1756 and 1757–1762
William Cavendish, 4th Duke of Devonshire
1756–1757
John Stuart, 3rd Earl of Bute
1762–1763
George Grenville
1763–1765
William Pitt, 1st Earl of Chatham
1766-1768
Augustus FitzRoy, 3rd Duke of Grafton
1768–1770
Frederick North, 2nd Earl of Guilford
1770–1782
Charles Watson-Wentworth, 2nd Marquess of Rockingham
1782
William Petty, 2nd Earl of Shelburne
1782-1783
William Cavendish-Bentinck, 3rd Duke of Portland
1783 and 1807–1809
William Pitt the Younger
1783–1801 and 1804–1806
Henry Addington, 1st Viscount Sidmouth
1801–1804
William Grenville, 1st Baron Grenville
1806-1807
Spencer Perceval
1809–1812
Robert Jenkinson, 2nd Earl of Liverpool
1812–1827
Frederick Robinson, 1st Viscount Goderich
1827-1828
Arthur Wellesley, 1st Duke of Wellington
1828–1830 and 1834
Charles Grey, 2nd Earl Grey
1830–1834
William Lamb, 2nd Viscount Melbourne
1834 and 1835–1841
Robert Peel, 2nd Baronet
1834–1835 and 1841–1846
John Russell, 1st Earl Russell
1846–1852 and 1865–1866
Edward Smith-Stanley, 14th Earl of Derby
1852, 1858–1859 and 1866–1868
George Hamilton-Gordon, 4th Earl of Aberdeen
1852–1855
Henry John Temple, 3rd Viscount Palmerston
1855–1858 and 1859–1865
Benjamin Disraeli, 1st Earl of Beaconsfield
1868 and 1874–1880
William Ewart Gladstone
1868–1874, 1880–1885, 1886 and 1892-1894
Robert Gascoyne-Cecil, 3rd Marquess of Salisbury
1885–1886, 1886–1892 and 1895–1902
Archibald Primrose, 5th Earl of Rosebery
1894–1895
Henry Campbell-Bannerman
1905–1908
Herbert Henry Asquith
1908–1916
David Lloyd George
1916–1922
Stanley Baldwin
1923–1924, 1924–1929 and 1935–1937
Ramsay MacDonald
1924 and 1929–1935
Neville Chamberlain
1937–1940
Winston Churchill
1940–1945 and 1951–1955
Harold MacMillan
1957–1963
Sir Alec Douglas-Home
1963–1964
Harold Wilson
1964–1970 and 1974–1976
Margaret Thatcher
1979–1990
Theresa May
2016–2019
The arms of Philip John May, borne by Theresa May de jure matrimonii