He should not be confused with his cousin John Fiennes Twisleton Crampton (1817–1888), a clergyman of the Church of Ireland.
[2] Crampton was appointed as Secretary of the British legation at Washington in July 1845, after previous diplomatic service in Turin, St Petersburg, Brussels, and Vienna.
[4] He was obliged to resign in 1856, on the demand of U.S. President Franklin Pierce, whose administration accused him of attempting to enlist recruits for the British Army during the Crimean War.
As some consolation, Crampton was appointed a Knight Commander of the Order of the Bath (KCB) on 30 September 1856.
[6] He resigned from his post in Spain with effect from 1 July 1869, when he retired with a pension, after more than forty years' diplomatic service.