Wentworth was a relative of Governor John Wentworth of New Hampshire. He owned plantations in Surinam, and was a stockbroker in London and Paris. During the American war he was an intelligence agent for the British Government, concerned primarily with Franco-American relations. Lord North considered him ‘the most important and truest informer we have had’,
He is related to the Marquis of Rockingham; is a particular friend of Lord Suffolk; is employed by the minister in difficult matters, keeping in touch with the Opposition as much as with the Royalists. This Mr. Wentworth speaks French like you and better than I do: he is one of the cleverest men in England.
Wentworth put a high price on his services. In addition to the pension of £739 p.a. he was receiving, he demanded a place at the Treasury Board, a baronetcy, and a seat in Parliament.
He died December 1793.
