I did post this is in the List of Prime Ministers thread a while back. POD is that Liverpool's stroke is delayed a few years. I did have a near revolutionary situation develop in 1848 due to the earlier failure of reform, but here the Whigs seize the opportunity like OTL, so the ATL is basically a delayed version of OTL's events. If the Whigs are weaker, it could be different.
List of Prime Ministers:
William Pitt the Younger (Independent Whig): 1783-1801
Henry Addington (King's Friends): 1801-1804
William Pitt the Younger (Independent Whig): 1804-1806
Lord Grenville (Grenvillite-Foxite): 1806-1807
Duke of Portland (Pittite): 1807-1809
Spencer Perceval (Tory): 1809-1812
Lord Liverpool (Tory): 1812-1831 [1]
Sir Robert Peel (Tory): 1831-1836 [2]
Duke of Devonshire (Coalition Whig-Huskissonite): 1836-1837 [3]
Sir Robert Peel (Tory): 1837-1840 [4]
Lord Lyndhurst (Tory): 1840-1843 [5]
Lord Lansdowne (Whig): 1843-1845 [6]
Lord Aberdeen (Tory): 1845-1848 [7]
Thomas Babington Macaulay (Whig): 1848-1859 [8]
Lord John Russell (Whig): 1859-1860 [9]
William Gladstone (Tory): 1860- [10]
[1] George Canning dies in 1827 and the Liberal Tories gravitate towards William Huskisson. The government becomes unpopular as the economy worsens and the July Revolution takes place in France. Lord Liverpool resigns after a stroke in 1831.
[2] After Liverpool's death, Peel forms a government without the Huskissonites, who demand Catholic Emancipation. Peel positions himself as a barrier against radical Dissent and his anti-catholicism is popular, but economic unrest and mounting pressure from Daniel O'Connell, the leader of the Emancipation movement, lead to the government's defeat in the Commons.
[3] Peel's defeat leads to attempts by Lord Holland and Huskisson to form governments. Both attempts fail, leading to a coalition of some Whigs and the Huskissonites under the moderate Whig grandee the Duke of Devonshire. The more radically minded Whigs under Brougham refuse to serve with Tories on principle.
[4] Peel re-enters office after the Duke of Devonshire's Catholic Emancipation bill is defeated in the House of Lords. A famine in Ireland fuels Catholic anger and the government struggles to retain control in Ireland. In addition, there is renewed pressure from dissenters for the repeal of the Test and Corporation Acts, and from radicals for parliamentary reform. Popular disorder mounts, and Peel is assassinated by an Irish militant, John Blake Dillon.
[5] Lord Lyndhurst, an Ultra-Tory lawyer, is Peel's successor as Prime Minister. The repressive legislation of the 1790s returns and, appealing to the Conservatives' landed base, Lyndhurst increases agricultural protection. His government is defeated, however, as it rejects petitions for Repeal.
[6] Lansdowne enters office and the Huskissonites are subsumed into the Whig party. He manages to repeal the Test and Corporation Acts, bringing joy to dissenters and alarming the Church of England. Then, he attempts to pass Catholic Emancipation, but the Lords reject it again for the third time as the Tories, for the first time, turn to public opinion for public leverage. Two rising stars of the Tory Party, William Gladstone and Benjamin Disraeli, give widely acclaimed speeches in the Commons and at public meetings defending the established Church. Lansdowne resigns.
[7] In 1846, an uprising begins in Ireland, as the radicalised reform movement seeks to establish Catholic equality by force. A bloody civil war follows. In 1848, as revolution sweeps Europe, huge Chartist demonstrations in favour of parliamentary reform sweep the country. The government loses authority and Aberdeen resigns.
[8] The renowned writer, orator and leader of the Whigs in the Commons, Thomas Macaulay forms a government and announces that the people (in his definition, the middle-class) have a rightful stake in government. Catholic Emancipation is passed in both the Commons and Lords in 1849, and an extensive reform bill is passed in 1851 which transforms the electoral landscape. In 1852, his government compromises with the Irish rebels and the Union is repealed, so a separate Irish Parliament returns. In 1853, Macaulay pleases commercial and industrial interests by repealing the Corn Law. From 1853 to 1858, Britain is engaged in a war against a resurgent Napoleonic France and Russia, which Britain wins. "The Great Patriot" Macaulay dies in 1859, and is regarded as the greatest Prime Minister since Pitt the Younger.
[9] Russell falls into controversy over his plans to weaken the Church of England's monopoly over education.
[10] Gladstone enters office after a general election promising to adhere to the 1851 Reform Act, but positions himself as the defender of the Church of England against Whig and nonconformist attacks. With his trusty Chancellor of the Exchequer, Benjamin Disraeli, Gladstone seeks to re-affirm Toryism in a new age...