Further Parliamentary career
Coke was re-elected to Parliament in 1790, at a time of great political trouble. The French Revolution a year earlier had torn the Whig party in half, with Coke and Fox in the isolated minority who supported the revolutionaries as their acts became more brutal. With the declaration of war in 1793, an impact was finally felt in Britain with a rise in agricultural prices and rent. It also led to the establishment of local yeomanry forces to defend the country, something Coke opposed. This reduced his popularity in Norfolk and led to suspicions he might be a Jacobin, to the point where he was forced to publicly declare that he was not a Republican and "detested their principles". Eventually, in late September 1798, he raised the Holkham Yeoman Cavalry, commanding it as a Major, to defend against any invasion. This unit was dissolved in 1802 with the Peace of Amiens, but after war broke out again a year later more volunteer regiments were formed. Coke was notably absent from any preparations for defence, feeling that the risks of invasion were exaggerated, but was eventually persuaded by public opinion to reform the Yeoman Cavalry in 1803; it was again dissolved in 1805.
The French Revolution had split the Whigs into two factions, but as it progressed Fox's group in support of the revolutionaries began to dwindle. Coke stuck by Fox, and with the outbreak of the War, the split became finalised; Fox refused to accept that Britain need be involved in the conflict, as did Coke. In Parliament, Coke spoke out against the conflict, debating the motion to raise money for the war through a new tax in April 1794, and supporting Wilberforce's anti-war motion on 24 March 1795. He felt more comfortable with local matters, however, and his main concerns "were those of the agricultural interest", arguing against a new land tax and introducing a bill to shorten the shooting season, allowing for the production of more corn. Coke was again returned to Parliament in 1796, despite an anti-war and anti-government address to the electorate which was condemned as arrogant and dictatorial, but found on his return that the Foxites had agreed to withdraw from Parliamentary activity.
After Parliament was dissolved in June 1802, another election saw Coke again returned, although in a contested election that cost the candidates £35,000. With the death of William Pitt in 1806, the two Whig groups agreed to an alliance, which took the form of the Ministry of All the Talents; Fox was confirmed as Foreign Secretary, and Windham as Secretary for War and the Colonies. The government reportedly offered Coke a peerage, which he refused primarily to focus on abolishing Britain's involvement in the Atlantic slave trade, which was accomplished roughly a year after Fox's death on 13 September 1806. Fox's death made Parliament lose some of its appeal to Coke, as they had been close friends. His attendance in the next two years was very limited, and the next occasion of note was his support of the Corn Laws, which were highly unpopular in Norfolk and led to him being physically attacked by a mob in 1815.
With the defeat of Napoleon at the Battle of Waterloo, the wars in Europe ended, and the troops returned home. As a result, the nation underwent dramatic shifts due to rising unemployment as the economy shifted and the government began to pay off its debts incurred during 20 years of war. Agricultural prices slumped, and Coke became active in opposing tax increases which would impact on the farmers. In February 1816 he spoke out against income and malt tax, and in March attacked the property tax as "utterly at variance with civil liberty". An opponent of government excess in a time of unemployment and high taxation, he also voted against the army estimates and opposed the Civil List in May. With a County Meeting on 5 April 1817, Coke spoke on the King's intent on "overturning democracy and enslaving the country" by restricting freedom of speech and the press, suggesting that the government needed to be removed.
Returning to Parliament in 1818, he argued against the Royal Households Bill and introduced a Game Law Amendment Bill, which was defeated. Following the Peterloo Massacre and the government's introduction of a Seditious Meetings Prevention Bill, Coke accused the government of being "most strongly implicated in the events in Manchester", saying that the meeting would have been peaceful had it not been "interfered with by the officious agents of authority". The 1820s saw Coke speak far less; firstly, because of the continued Tory domination of Parliament, and secondly because of his remarriage. In 1822, at the age of 68 and after 21 years as a widower, he married Anne Keppel, the daughter of Lord Albemarle, and Coke's 18-year-old godchild. Anne had initially been brought to Holkham to partner with his nephew William, who due to Coke's lack of sons would inherit the estate, but they failed to get on. Anne and Coke's marriage was met with bemusement, and described as "absurd", but despite opposition took place on 26 February. Soon after the wedding, Anne became pregnant, and their son Thomas was born on 22 December.
In 1831, Coke's personal friend Earl Grey became Prime Minister; as a result, Coke's appearances in Parliament became more regular. He expressed delight at the Great Reform Act 1832, although he only spoke on the subject once, and chose its passage on 4 June 1832 as the appropriate moment to retire as an MP. As the "greatest commoner in England", Coke finally accepted a peerage in July 1837 (having been offered one six times before), becoming the Earl of Leicester. He took no pleasure in attending the House of Lords, however, describing it as "the hospital for incurables".