In 1776 Coke inherited extensive Norfolk and Derbyshire estates from his father and was returned in his place for Norfolk. His real interests were in country pursuits, particularly in the improvement of his estates where his achievements were to bring him considerable fame; and of his first entry into Parliament he himself said many years later that he had stood
with great reluctance, for I had no wish to come into Parliament. I was no orator, no politician ... But I was much solicited by Sir Harbord Harbord, Sir E. Astley, and Mr. Fellowes of Shottisham, who said ... I owed it to my father’s memory ... and that if I did not, a Tory would come in. At the mention of a Tory ... my blood chilled all over me from head to foot, and I came forward.
In Parliament Coke regularly voted against North’s Administration till its fall:
When I first went into Parliament, I attached myself to Fox, and I clung to him through life [he stated at his nomination meeting in 1830]. I lived in the closest bond of friendship with him. He was a friend of the people, the practiser of every kindness and generosity, the advocate of civil and religious liberty.
Norwich Merc. 7 Aug. 1830, quoted by A. M. W. Stirling, Coke of Norfolk, i. 165.
Coke’s strong dislike of the American war was voiced in his speech on 4 Dec. 1778
Coke was one of the few great Norfolk landowners who supported the petitioning movement, and on 23 Feb. 1780 he presented the Norfolk petition to the House.
On the fall of North, Coke naturally supported the Rockingham Administration, and in June 1782 it was reported that he would be included in the next creation of peers.
At the general election of 1784 Coke again stood for Norfolk, but his support of the Coalition had for the time being weakened his position in the county, and he was obliged to withdraw to avoid an expensive and probably unavailing contest. After 1790 he represented the county for the next forty years.
Coke died 30 June 1842.
