William IV was King of the United Kingdom of Great Britain and Ireland from 26 June 1830 until his death in 1837. The third son of George III, William succeeded his elder brother George IV, becoming the last king and penultimate monarch of Britain's House of Hanover.

William served in the Royal Navy in his youth and was nicknamed the "Sailor King". In 1789, he was created Duke of Clarence and St Andrews. In 1827, he was appointed as Britain's first Lord High Admiral since 1709. As his two older brothers died without leaving legitimate issue, he inherited the throne when he was 64 years old. His reign saw several reforms: the poor law was updated, child labour restricted, slavery abolished in nearly all of the British Empire, and the British electoral system refashioned by the Reform Act 1832. He was the last monarch to appoint a prime minister contrary to the will of Parliament.

At the time of his death William had no surviving legitimate children. He was succeeded by his niece Victoria and in Hanover by his brother Ernest Augustus.

Charles Grey, 2nd Earl Grey, (13 March 1764 – 17 July 1845), known as Viscount Howick between 1806 and 1807, was a member of the Whig Party and was a long-time leader of multiple reform movements, most famously the Reform Act 1832. His government also saw the abolition of slavery in the British Empire, in which the government purchased slaves from their owners in 1833. Grey was a strong opponent of the foreign and domestic policies of William Pitt the Younger in the 1790s. In 1807, he resigned as foreign secretary to protest the King's uncompromising rejection of Catholic Emancipation. Grey finally resigned in 1834 over disagreements in his cabinet regarding Ireland, and retired from politics.

Earl Grey tea is named after him.

In 1832, a Royal Commission into the Poor Law recommended changes to the system of parish poor relief. Many of its recommendations were incorporated into the Poor Law Amendment Act of 1834.

This statute maintained outdoor relief (relief given outside a workhouse), but led to more central control of the system

The Workhouse originated in the Poor Law Act 1388 but mass unemployment after the Napoleonic Wars, & the introduction of technology to replace agricultural workers meant the established system was unsustainable. The Poor Law of 1834 discouraged the provision of relief to anyone who refused to enter a workhouse. Life in a workhouse was harsh but in the provision of free medical care & education for children inmates were advantaged over the general population

William Lamb, 2nd Viscount Melbourne, (15 March 1779 – 24 November 1848) was a British Whig statesman who served as Home Secretary (1830–1834) and Prime Minister (1834 and 1835–1841). He is best known for his intense and successful mentoring of Queen Victoria in the ways of politics, when she was between the ages of 18 and 21. Historians have concluded that Melbourne does not rank highly as a Prime Minister, for there were no great foreign wars or domestic issues to handle, he lacked major achievements, and he enunciated no grand principles. "But he was kind, honest and not self-seeking."

Melbourne was Prime Minister on two occasions. The first ended when he was dismissed by King William IV in 1834, the last British prime minister to be dismissed by a monarch. Six months later he was re-appointed and served for six years.

Arthur Wellesley, 1st Duke of Wellington, (1 May 1769 – 14 September 1852) was an Anglo-Irish soldier and Tory statesman who was one of the leading military and political figures of 19th-century Britain, serving twice as Prime Minister. His victory against Napoleon at the Battle of Waterloo in 1815 puts him in the first rank of Britain's military heroes.

This, his second term as PM, was a caretaker role until a new leader was found.

Sir Robert Peel, 2nd Baronet, (5 February 1788 – 2 July 1850) was a British statesman and Conservative Party politician who served twice as Prime Minister of the United Kingdom (1834–35 and 1841–46) and twice as Home Secretary (1822–27 and 1828–30). He is regarded as the father of modern British policing and as one of the founders of the modern Conservative Party.

His first administration was a minority government, dependent on Whig support and with Peel serving as his own Chancellor of the Exchequer. After only four months, his government collapsed and he served as Leader of the Opposition during the second government of the Viscount Melbourne (1835–1841).

William Lamb, 2nd Viscount Melbourne, (15 March 1779 – 24 November 1848) was a British Whig statesman who served as Home Secretary (1830–1834) and Prime Minister (1834 and 1835–1841). He is best known for his intense and successful mentoring of Queen Victoria in the ways of politics, when she was between the ages of 18 and 21. Historians have concluded that Melbourne does not rank highly as a Prime Minister, for there were no great foreign wars or domestic issues to handle, he lacked major achievements, and he enunciated no grand principles. "But he was kind, honest and not self-seeking."

Melbourne was Prime Minister on two occasions. The first ended when he was dismissed by King William IV in 1834, the last British prime minister to be dismissed by a monarch. Six months later he was re-appointed and served for six years.