Ministry of All the Talents
The Ministry of All the Talents was a national unity government formed by William Wyndham Grenville, 1st Baron Grenville on his appointment as Prime Minister of the United Kingdom on 11 February 1806 after the death of William Pitt the Younger. 
With the country at war, Grenville aimed to form the strongest possible government and so included most leading politicians from almost all groupings, although some followers of Pitt, led by George Canning, refused to join.
The inclusion of Charles James Fox raised eyebrows as King George III had been previously heavily hostile to Fox, but the King's willingness to put aside past enmities for the sake of national unity encouraged many others to join or support the government as well. The ministry boasted a fairly progressive agenda, much of it inherited from Pitt.
The Ministry of All the Talents had comparatively little success, failing to bring the sought-after peace with France (the war continued for nearly another decade). It did, however, abolish the slave trade in Britain in 1807 before it broke up over the question of Catholic emancipation.
Other uses of the term
The term has since been used in politics to describe an administration with members from more than one party or even a non-coalition government that enjoys cross party support due to gifted and or non partisan members. Examples include the coalition government which led Great Britain through the Second World War and the Canadian government that won the 1896 election. 
List of Ministers
February 1806 – March 1807
Members of the Cabinet are in bold face.
Second Pitt the Younger Ministry
|Government of the United Kingdom
Second Portland ministry