[1] On 13 November 1830, he was named paid attaché at Rio de Janeiro, but he did not remain long in South America, as he served temporarily with Sir Stratford Canning's special embassy to Constantinople from 31 October 1831 to 18 September 1832.

He was with Sir Charles Vaughan's special mission to Constantinople from March 1837 to September 1838 and then proceeded to St. Petersburg as paid attaché on 6 October 1838.

[1] Few men seem to have gone through a greater number of changes in the diplomatic service; he was secretary of legation at Florence 24 August 1841 and chargé d'affaires from July 1842 to October 1843 and from March to May 1844.

[2] In 1853, he was named envoy extraordinary to the king of Denmark, and he acted as her majesty's representative at the conference of Copenhagen in November 1855 for the definite arrangement of the Sound Dues question.

[citation needed] He became ambassador extraordinary and plenipotentiary to the King of Prussia 28 October 1862 for which he was sworn to the Privy Council.