Coke was again returned to Parliament in 1790, sitting continuously until 1832, and he primarily spoke on matters of local interest, such as the Corn Laws. His second focus was on civil liberties, and he spoke out against the government's response to the Peterloo Massacre and similar events. Described as the "greatest commoner in England", he chose the passage of the Great Reform Act 1832 as the moment to retire, later being made the Earl of Leicester in July 1837. After a short illness, Coke died on 30 June 1842, and was succeeded as Earl by his son Thomas. Coke's main legacy is as an agricultural reformer, not as a politician; he has historically been credited with sparking the British Agricultural Revolution through the reforms he made to farming on his estates. Later historians have questioned this, however, noting that the developments credited to him are most likely the work of other individuals; nevertheless, he has still been described as "the real hero of Norfolk agriculture".