樞密院議長
Buckingham's political career was stagnant until 1866, when he was appointed to the Privy Council and became Lord Derby's Lord President of the Council. During the interregnum, Buckingham served as chairman of the executive committee of the royal commission for the Great Exhibition of 1862. He served as Lord President of the Council until 8 March 1867, when he succeeded Lord Carnarvon as Secretary of State for the Colonies.